No need to set options in WillStartClient

We can set them any time up to that point

src/MatrixClientPeg.js

@@ -42,8 +42,9 @@ class MatrixClientPeg {
         this.matrixClient = null;
 
         // These are the default options used when Lifecycle.js
-        // starts the client. These can be altered when the
-        // 'will_start_client' event is dispatched.
+        // starts the client. These can be altered at any
+        // time up to after the 'will_start_client' event is
+        // finished processing.
         this.opts = {
             initialSyncLimit: 20,
         };

src/components/structures/MatrixChat.js

@@ -146,6 +146,10 @@ module.exports = React.createClass({
         // whilst logged in as a guest user (so they can change
         // their mind & log back in)
         this.guestCreds = null;
+
+        if (this.props.config.sync_timeline_limit) {
+            MatrixClientPeg.opts.initialSyncLimit = this.props.config.sync_timeline_limit;
+        }
     },
 
     componentDidMount: function() {
@@ -601,15 +605,11 @@ module.exports = React.createClass({
 
     /**
      * Called just before the matrix client is started
-     * (useful for setting options and listeners)
+     * (useful for setting listeners)
      */
     _onWillStartClient() {
         var cli = MatrixClientPeg.get();
 
-        if (this.props.config.sync_timeline_limit) {
-            MatrixClientPeg.opts.initialSyncLimit = this.props.config.sync_timeline_limit;
-        }
-
         var self = this;
         cli.on('sync', function(state, prevState) {
             self.updateFavicon(state, prevState);