[Martijn]

I just noticed that my Plugin Slideshow Screensaver addon doesn't display in the Screensaver category, although it does show up in the list of my addons.

Hi ruuk,
that's because you have two extension points (screensaver and service) and we currently only support one main extension point in our DB structure. In your case the later is overwriting the screensaver one, so your screensaver is showing up in services atm. Will fix this to prefer the first one.

XBMC add-on manager also prefers first one so that makes sence