After a couple of days of hard work, here is the completely rewritten Game Categories Plugin.
It features two new modes, Multi-MS mode and Pre-Game-Menu mode, shown in the screenshots below. Click the link for more information. :)
Before you post about any issues you're having, make sure you read over the complete readme carefully.
More information and download here.
Edit: Released version two, changes:
Edit: Released version three, changes:Originally Posted by Changes
Originally Posted by Changes