Slideshow with iPhoto pictures instead of photostream?

It seems that an Apple TV software update has changed the way the Apple TV shows photos. In the past, I was able to have the "screensaver" show photos from my entire iPhoto library. Now it seems limited only to "photostream" which I understand has a limit of 1,000 photos? I have 20,000 photos, so that is a massive reduction. What was Apple thinking?

Is there any way to have Apple TV stream off of my entire iPhoto library instead of just photostream?