The only three finger gestures implemented are 3-finger swipes and those you must configure in SysPrefs->Keyboard->Keyboard Shortcuts (do the swipe instead of pressing keys).
As far as acceleration/tracking it should be ok provided nothing much has changed in the Synaptics pad. Chekc your settings in SysPrefs->Trackpad. Check system.log for what firmware the trackpad reports (search for 'synaptics'). Also, if you haven't already done so, you should repair permissions (Disk Utility), rebuild cache (DPCIManager), and do an EC reset: Shutdown, remove all power sources, hold power 30 sec, put everything back & restart.
What I see in ioreg is good so far... I see you loaded ACPIBattery.kext, but it is not working (needs DSDT patches).
You should probably test sleep...