Does Compiz support Multipointer X?
http://ubuntuforums.org/showthread.php?t=921240 i did some research, and it looks like this forum link had a possible solution, but it involved compiling code.
it confused me, but someone here might be able to make sense of it.
http://who-t.blogspot.com/2012/01/multitouch-in-x-touch-grab-handling.html
this is the blog of the guy whos been handling it with some more recent information.
EDIT: to answer your question, compiz does not support it as of now, at least by default.