Anyone running 9 or 10 speakers in their HT setup?

I am currently running 5.1 and I'm cosidering going with an additional four more full-range surround speakers for a 9.1 setup. Of course it won't be 9 separate channels. My processor(Sunfire Theater Grand 5), only outputs 5.1 discrete channels My processor has outputs for two "side axis" speakers that are matrixed from the front speakers, and it has outputs for regular surrounds and back surrounds. I do know that there is no 9.1 content, but the processor will route the 5.1 signal to the additional speakers. Ever since I saw The Dark Knight at an IMAX theater, I've stayed awake nights trying to figure out a way to replicate the incredible sound that I heard in that theater. My system at home has always sounded as good, if not, better that the sound I hear at comercial theaters...and I've heard some good ones. After hearing the IMAX system, I left with my tail tucked between my legs. I counted six or eight speakers on each side of the room overhead and four speakers in the rear overhead....not counting the fronts and the center channel and the obvious subwoofers. I kind of get the feeling that more is better. I've looked at the layout of my room and I could easily add the additional four surround speakers without ruining my room aesthetics. The additional four surrounds will be mounted 10 feet off the floor as seen in comercial theaters.

The IMAX has changed forever the way I view movies. It is the new Holy Grail of theater sound systems.