Try to remove the trackpad plugin from VoodooPS2Controller.kext/Contents/PlugIns, it should work with the mouse plugin (mine does, it's an Elantech trackpad).
For USB you probably need to patch DSDT (guess you can use Sandy Bridge patches) http://Olarila.com/forum/viewtopic.php?f=19&t=634
For HD 4000 try this (sorry, portuguese, use Google translator) http://Olarila.com/forum/viewtopic.php?f=3&t=1583