diff --git a/common/content/buffer.js b/common/content/buffer.js
index b905e2c2..f3621cb2 100644
--- a/common/content/buffer.js
+++ b/common/content/buffer.js
@@ -1621,7 +1621,16 @@ var Buffer = Module("buffer", {
             function (args) { buffer.scrollVertical("pages", -Math.max(args.count, 1)); },
             { count: true });
 
-        mappings.add([modes.COMMAND], ["<C-f>", "<PageDown>", "<Space>", "<scroll-page-down>"],
+        mappings.add([modes.COMMAND], ["<Space>"],
+            "Scroll down a full page",
+            function (args) {
+                if (isinstance(content.document.activeElement, [HTMLInputElement, HTMLButtonElement]))
+                    return Events.PASS;
+                buffer.scrollVertical("pages", Math.max(args.count, 1));
+            },
+            { count: true });
+
+        mappings.add([modes.COMMAND], ["<C-f>", "<PageDown>", "<scroll-page-down>"],
             "Scroll down a full page",
             function (args) { buffer.scrollVertical("pages", Math.max(args.count, 1)); },
             { count: true });
diff --git a/common/content/modes.js b/common/content/modes.js
index 4aa01a14..0d286ffa 100644
--- a/common/content/modes.js
+++ b/common/content/modes.js
@@ -428,6 +428,8 @@ var Modes = Module("modes", {
                 util.assert(options.bases.every(function (m) m instanceof this, this.constructor),
                            _("mode.invalidBases"), true);
 
+            this.description = options.description || name;
+
             update(this, {
                 id: 1 << Modes.Mode._id++,
                 name: name,
@@ -435,6 +437,8 @@ var Modes = Module("modes", {
             }, options);
         },
 
+        description: Messages.Localized(""),
+
         isinstance: function isinstance(obj)
             this === obj || this.allBases.indexOf(obj) >= 0 || callable(obj) && this instanceof obj,
 
@@ -452,8 +456,6 @@ var Modes = Module("modes", {
 
         get count() !this.insert,
 
-        get description() this._display,
-
         _display: Class.memoize(function _display() this.name.replace("_", " ", "g")),
 
         display: function display() this._display,
@@ -470,7 +472,7 @@ var Modes = Module("modes", {
 
         passEvent: function passEvent(event) this.input && event.charCode && !(event.ctrlKey || event.altKey || event.metaKey),
 
-        passUnknown: Class.memoize(function () options.get("passunknown").getKey(this.name)),
+        passUnknown: Class.memoize(function () options.get("passunknown").has(this.name)),
 
         get mask() this,
 
@@ -543,12 +545,16 @@ var Modes = Module("modes", {
     options: function initOptions() {
         options.add(["passunknown"],
             "Pass through unknown keys in these modes",
-            "regexplist", "",
+            "stringlist", "",
             {
-                regexpFlags: "i",
+                has: function (val) this.value.indexOf(val.toLowerCase()) >= 0,
+
                 setter: function (val) {
                     modes.all.forEach(function (m) { delete m.passUnknown });
-                }
+                    return val.map(String.toLowerCase);
+                },
+
+                get values() [[m.name.toLowerCase(), m.description] for (m in values(modes._modes)) if (!m.hidden)]
             });
 
         options.add(["showmode", "smd"],