diff --git a/app/assets/js/assetguard.js b/app/assets/js/assetguard.js
index 6def451..dde64c3 100644
--- a/app/assets/js/assetguard.js
+++ b/app/assets/js/assetguard.js
@@ -247,6 +247,20 @@ class AssetGuard extends EventEmitter {
         return cs.join('/')
     }
 
+    /**
+     * Resolves an artiface id without the version. For example,
+     * 'net.minecraftforge:forge:1.11.2-13.20.0.2282' becomes
+     * 'net.minecraftforge:forge'.
+     * 
+     * @param {string} artifactid The artifact id string.
+     * @returns {string} The resolved identifier without the version.
+     */
+    static _resolveWithoutVersion(artifactid){
+        let ps = artifactid.split(':')
+
+        return ps[0] + ':' + ps[1]
+    }
+
     // #endregion
 
     // Static Hash Validation Functions
diff --git a/app/assets/js/configmanager.js b/app/assets/js/configmanager.js
index 138d28d..5a9bf47 100644
--- a/app/assets/js/configmanager.js
+++ b/app/assets/js/configmanager.js
@@ -69,7 +69,8 @@ const DEFAULT_CONFIG = {
     clientToken: uuidV4().replace(/-/g, ''),
     selectedServer: null, // Resolved
     selectedAccount: null,
-    authenticationDatabase: {}
+    authenticationDatabase: {},
+    modConfigurations: []
 }
 
 let config = null;
@@ -92,7 +93,6 @@ exports.save = function(){
  */
 exports.load = function(){
     // Determine the effective configuration.
-    //const EFFECTIVE_CONFIG = config == null ? DEFAULT_CONFIG : config
     const filePath = path.join(dataPath, 'config.json')
 
     if(!fs.existsSync(filePath)){
@@ -353,6 +353,57 @@ exports.setSelectedAccount = function(uuid){
     return authAcc
 }
 
+/**
+ * Get an array of each mod configuration currently stored.
+ * 
+ * @returns {Array.<Object>} An array of each stored mod configuration.
+ */
+exports.getModConfigurations = function(){
+    return config.modConfigurations
+}
+
+/**
+ * Set the array of stored mod configurations.
+ * 
+ * @param {Array.<Object>} configurations An array of mod configurations.
+ */
+exports.setModConfigurations = function(configurations){
+    config.modConfigurations = configurations
+}
+
+/**
+ * Get the mod configuration for a specific server.
+ * 
+ * @param {string} serverid The id of the server.
+ * @returns {Object} The mod configuration for the given server.
+ */
+exports.getModConfiguration = function(serverid){
+    const cfgs = config.modConfigurations
+    for(let i=0; i<cfgs.length; i++){
+        if(cfgs[i].id === serverid){
+            return cfgs[i]
+        }
+    }
+    return null
+}
+
+/**
+ * Set the mod configuration for a specific server. This overrides any existing value.
+ * 
+ * @param {string} serverid The id of the server for the given mod configuration.
+ * @param {Object} configuration The mod configuration for the given server.
+ */
+exports.setModConfiguration = function(serverid, configuration){
+    const cfgs = config.modConfigurations
+    for(let i=0; i<cfgs.length; i++){
+        if(cfgs[i].id === serverid){
+            cfgs[i] = configuration
+            return
+        }
+    }
+    cfgs.push(configuration)
+}
+
 // User Configurable Settings
 
 // Java Settings
diff --git a/app/assets/js/processbuilder.js b/app/assets/js/processbuilder.js
index 8bb12f0..fe08bf9 100644
--- a/app/assets/js/processbuilder.js
+++ b/app/assets/js/processbuilder.js
@@ -1,18 +1,14 @@
-/**
- * The initial iteration of this file will not support optional submodules.
- * Support will be added down the line, only top-level modules will recieve optional support.
- */
-const AdmZip = require('adm-zip')
+const AdmZip                = require('adm-zip')
 const {AssetGuard, Library} = require('./assetguard.js')
-const child_process = require('child_process')
-const ConfigManager = require('./configmanager.js')
-const crypto = require('crypto')
-const fs = require('fs')
-const mkpath = require('mkdirp')
-const os = require('os')
-const path = require('path')
-const rimraf = require('rimraf')
-const {URL} = require('url')
+const child_process         = require('child_process')
+const ConfigManager         = require('./configmanager.js')
+const crypto                = require('crypto')
+const fs                    = require('fs')
+const mkpath                = require('mkdirp')
+const os                    = require('os')
+const path                  = require('path')
+const rimraf                = require('rimraf')
+const {URL}                 = require('url')
 
 class ProcessBuilder {
 
@@ -26,11 +22,6 @@ class ProcessBuilder {
         this.fmlDir = path.join(this.commonDir, 'versions', this.server.id + '.json')
         this.libPath = path.join(this.commonDir, 'libraries')
     }
-
-    static shouldInclude(mdle){
-        //If the module should be included by default
-        return mdle.required == null || mdle.required.value == null || mdle.required.value === true || (mdle.required.value === false && (mdle.required.def == null || mdle.required.def === true))
-    }
     
     /**
      * Convienence method to run the functions typically used to build a process.
@@ -77,12 +68,19 @@ class ProcessBuilder {
     resolveDefaultMods(options = {type: 'forgemod'}){
         //Returns array of default forge mods to load.
         const mods = []
-        const mdles = this.server.modules
+        const mdls = this.server.modules
+        const modCfg = ConfigManager.getModConfiguration(this.server.id).mods
     
-        for(let i=0; i<mdles.length; ++i){
-            if(mdles[i].type != null && mdles[i].type === options.type){
-                if(ProcessBuilder.shouldInclude(mdles[i])){
-                    mods.push(mdles[i])
+        for(let i=0; i<mdls.length; ++i){
+            const mdl = mdls[i]
+            if(mdl.type != null && mdl.type === options.type){
+                if(mdl.required != null && mdl.required.value === false){
+                    const val = modCfg[AssetGuard._resolveWithoutVersion(mdl.id)]
+                    if(val === true){
+                        mods.push(mdl)
+                    }
+                } else {
+                    mods.push(mdl)
                 }
             }
         }
diff --git a/app/assets/js/scripts/uibinder.js b/app/assets/js/scripts/uibinder.js
index 064dcca..8648097 100644
--- a/app/assets/js/scripts/uibinder.js
+++ b/app/assets/js/scripts/uibinder.js
@@ -125,10 +125,86 @@ function showFatalStartupError(){
     }, 750)
 }
 
+/**
+ * Common functions to perform after refreshing the distro index.
+ * 
+ * @param {Object} data The distro index object.
+ */
 function onDistroRefresh(data){
     updateSelectedServer(AssetGuard.getServerById(ConfigManager.getSelectedServer()).name)
     refreshServerStatus()
     initNews()
+    syncModConfigurations(data)
+}
+
+/**
+ * Sync the mod configurations with the distro index.
+ * 
+ * @param {Object} data The distro index object.
+ */
+function syncModConfigurations(data){
+
+    const syncedCfgs = []
+
+    const servers = data.servers
+
+    for(let i=0; i<servers.length; i++){
+
+        const id = servers[i].id
+        const mdls = servers[i].modules
+        const cfg = ConfigManager.getModConfiguration(servers[i].id)
+
+        if(cfg != null){
+
+            const modsOld = cfg.mods
+            const mods = {}
+
+            for(let j=0; j<mdls.length; j++){
+                const mdl = mdls[j]
+                if(mdl.type === 'forgemod'){
+                    if(mdl.required != null){
+                        if(mdl.required.value === false){
+                            const mdlID = AssetGuard._resolveWithoutVersion(mdl.id)
+                            if(modsOld[mdlID] == null){
+                                mods[mdlID] = mdl.required.def != null ? mdl.required.def : true
+                            } else {
+                                mods[mdlID] = modsOld[mdlID]
+                            }
+                        }
+                    }
+                }
+            }
+
+            syncedCfgs.push({
+                id,
+                mods
+            })
+
+        } else {
+
+            const mods = {}
+
+            for(let j=0; j<mdls.length; j++){
+                const mdl = mdls[j]
+                if(mdl.type === 'forgemod'){
+                    if(mdl.required != null){
+                        if(mdl.required.value === false){
+                            mods[AssetGuard._resolveWithoutVersion(mdl.id)] = mdl.required.def != null ? mdl.required.def : true
+                        }
+                    }
+                }
+            }
+
+            syncedCfgs.push({
+                id,
+                mods
+            })
+
+        }
+    }
+
+    ConfigManager.setModConfigurations(syncedCfgs)
+    ConfigManager.save()
 }
 
 function refreshDistributionIndex(remote, onSuccess, onError){
@@ -223,6 +299,7 @@ document.addEventListener('readystatechange', function(){
 // Actions that must be performed after the distribution index is downloaded.
 ipcRenderer.on('distributionIndexDone', (event, data) => {
     if(data != null) {
+        syncModConfigurations(data)
         if(document.readyState === 'complete'){
             showMainUI()
         } else {