You need to add new classes that have same number of ability/attribute/talent points as defined in that properties file for classes to show up.
Note: Very easy to add new class presets to game. Just new to copy and rename one of the class files.
Then edit the Classname attribute line to
<attribute id="ClassName" value="NameOfClass" handle="" type="28" />
with NameOfClass being the name of new class preset.
Also, my tests show you can only add new classes not edit the default class presets.
