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Actually, kwin's compositor is so bad it's unusable.. Xfwm4's is awesome, it almost works. But kwin's is just baaaad (or at least the 3.4.0 one was).
Also, xapp's will composite anything. Gnome is right to not include one; it'd just be a lot of extra list traffic like this:
"my compositor doesn't work"
"are you gonna fix it?"
"why do you tell me to shutup?"
"but it's in there, so isn't it supported?"
"NO, leave us alone already!"