Drop down list seems to be working with pre-values :)

src/Umbraco.Web.UI.Client/src/views/propertyeditors/dropdown/dropdown.controller.js

@@ -8,12 +8,14 @@ angular.module("umbraco").controller("Umbraco.Editors.DropdownController",
             keyName: "alias",
             valueName: "name"
         };
-        
+
         //map the user config
         angular.extend(config, $scope.model.config);
         //map back to the model
         $scope.model.config = config;
         
+        $scope.selectExpression = "e." + config.keyName + " as e." + config.valueName + " for e in model.config.items";
+
         //now we need to format the items in the array because we always want to have a dictionary
         for (var i = 0; i < $scope.model.config.items.length; i++) {
             if (angular.isString($scope.model.config.items[i])) {

src/Umbraco.Web.UI.Client/src/views/propertyeditors/dropdown/dropdown.html

@@ -1,7 +1,6 @@
 <div ng-controller="Umbraco.Editors.DropdownController">
     <select name="dropDownList"
         ng-model="model.value" 
-        required  
-        ng-options="e.alias as e.name for e in model.config.items"></select>    
+        ng-options="{{selectExpression}}"></select>    
 </div>