i have separate options for the mouse and keyboard and i have my notebook listed as MacBookPro5,3 in system profiler and it still works. Did you try the kexts that are in my extra folder? Because i know for sure that the VooDooPS2Controller cannot work without the AppleACPIPS2Nub part I have fully working sound and no problem with the trackpad using those two kexts.

cheers

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MSI P5Q / C2D E8400 @ 3.0 Ghz / 8GB DDR2 800Mhz / PCIe ECS 9600GT 1Gb / ALC1200 / Windows 7 / OS X 10.8
ASUS K50IN (SX004L) / C2D T6400 @ 2.0 Ghz / 4GB DDR2 800Mhz / nVidia G102M 512Mb / 15.6" HD/LED / ALC662 / Dell 1490 802.11g / Windows 7 / OS X 10.8