[Etharr]

Maybe something like this:

PHP Code:

System->Add-ons->
* Search (recursive)
* Enabled Add-ons
* Disabled Add-ons
* Install from file
* <hr>
* Apperance
__* Screensaver
__* Skins
__* Support modules (python/skin art)
* Executables
__* Games (add as future requirement)
__* Programs
__* Services
* Media extentions
__* Lyrics
__* Subtitles
* Media sources
__* Music
__* Pictures
__* Video
* Metadata (or all these just one level down)
__* Artists
__* Albums
__* Movies
__* Music videos
__* TV-Shows
__* Support modules (scraper modules)
* Plugins (binary/third party)
__* Encoders
__* something
__* something
* Tools
__* Repositories
__* Webinterface 


And no repositories level. I guess that's better way to handle this.
Additional icon/label maybe?