Tweaking Clutter-Mutter tandem in 12.2 ?

Is there a way the desktop animation effects in Gnome 3.6 (and following) to be tweaked or eventually added new effects ? The Mutter-Clutter tandem is lacking of that kind of information.

OpenSuSE 12.2 x64, NVidia 304.xx , KDE 4.10 x64 , Gnome 3.6 x64 and so on.