diff --git a/src/ace/KeyBinding.js b/src/ace/KeyBinding.js
index 16411920..d5b4842d 100644
--- a/src/ace/KeyBinding.js
+++ b/src/ace/KeyBinding.js
@@ -5,26 +5,15 @@ require.def("ace/KeyBinding",
 var KeyBinding = function(element, editor, config) {
     this.editor = editor;
     this.setConfig(config);
-    var keys = this.keys;
 
     var _self = this;
     ace.addKeyListener(element, function(e) {
-        var key = [];
-        if (e.ctrlKey) {
-            key.push("Ctrl");
-        }
-        if (e.metaKey) {
-            key.push("Meta");
-        }
-        if (e.altKey) {
-            key.push("Alt");
-        }
-        if (e.shiftKey) {
-            key.push("Shift");
-        }
-        key.push(keys[e.keyCode] || String.fromCharCode(e.keyCode));
+        var hashId = 0 | (e.ctrlKey ? 1 : 0) | (e.altKey ? 2 : 0)
+            | (e.shiftKey ? 4 : 0) | (e.metaKey ? 8 : 0);
+        var key = _self.keyNames[e.keyCode];
 
-        var command = _self[_self.config.reverse[key.join("-")]];
+        var command = _self[(_self.config.reverse[hashId] || {})[(key
+            || String.fromCharCode(e.keyCode)).toLowerCase()]];
         if (command) {
             _self.selection = editor.getSelection();
             command.call(_self);
@@ -34,24 +23,62 @@ var KeyBinding = function(element, editor, config) {
 };
 
 (function() {
-    this.keys = {
-        8 : "Backspace",
-        9 : "Tab",
-        16 : "Shift",
-        17 : "Ctrl",
-        18 : "Alt",
-        33 : "PageUp",
-        34 : "PageDown",
-        35 : "End",
-        36 : "Home",
-        37 : "Left",
-        38 : "Up",
-        39 : "Right",
-        40 : "Down",
-        45 : "Insert",
-        46 : "Delete",
-        91 : "Meta"
+    this.keyMods = {"ctrl": 1, "alt": 2, "option" : 2, "shift": 4, "meta": 8, "command": 8};
+
+    this.keyNames = {
+        "8"  : "Backspace",
+        "9"  : "Tab",
+        "13" : "Enter",
+        "27" : "Esc",
+        "32" : "Space",
+        "33" : "PageUp",
+        "34" : "PageDown",
+        "35" : "End",
+        "36" : "Home",
+        "37" : "Left",
+        "38" : "Up",
+        "39" : "Right",
+        "40" : "Down",
+        "45" : "Insert",
+        "46" : "Del",
+        "107": "+",
+        "112": "F1",
+        "113": "F2",
+        "114": "F3",
+        "115": "F4",
+        "116": "F5",
+        "117": "F6",
+        "118": "F7",
+        "119": "F8",
+        "120": "F9",
+        "121": "F10",
+        "122": "F11",
+        "123": "F12"
     };
+    
+    function splitSafe(s, separator, limit, bLowerCase) {
+        return (bLowerCase && s.toLowerCase() || s)
+            .replace(/(?:^\s+|\n|\s+$)/g, "")
+            .split(new RegExp("[\\s ]*" + separator + "[\\s ]*", "g"), limit || 999);
+    }
+
+    function parseKeys(keys, val, ret) {
+        var key,
+            hashId = 0,
+            parts  = splitSafe(keys, "\\-", null, true),
+            i      = 0,
+            l      = parts.length;
+
+        for (; i < l; ++i) {
+            if (this.keyMods[parts[i]])
+                hashId = hashId | this.keyMods[parts[i]];
+            else
+                key = parts[i] || "-"; //when empty, the splitSafe removed a '-'
+        }
+
+        (ret[hashId] || (ret[hashId] = {}))[key] = val;
+        return ret;
+    }
 
     function objectReverse(obj, keySplit) {
         var i, j, l, key,
@@ -61,10 +88,10 @@ var KeyBinding = function(element, editor, config) {
             if (keySplit && typeof key == "string") {
                 key = key.split(keySplit);
                 for (j = 0, l = key.length; j < l; ++j)
-                    ret[key[j].replace(/Command/i, "Meta").replace(/Option/i, "Alt")] = i;
+                    parseKeys.call(this, key[j], i, ret);
             }
             else {
-                ret[key.replace(/Command/i, "Meta").replace(/Option/i, "Alt")] = i;
+                parseKeys.call(this, key, i, ret);
             }
         }
         return ret;
@@ -75,7 +102,7 @@ var KeyBinding = function(element, editor, config) {
             ? default_mac
             : default_win);
         if (typeof this.config.reverse == "undefined")
-            this.config.reverse = objectReverse(this.config, "|");
+            this.config.reverse = objectReverse.call(this, this.config, "|");
     };
 
     this["selectall"] = function() {