I've made some new kexts that allow you to use Apple's AppleUSBHIDMouse.kext or AppleUSBHIDMouse.kext.
All you need to do is replace 4x the USB Vendor and USB Device entries with the decimal value of your keyboard or mouse and install them.
They will then after reboot ensure you are using Apple's kexts (which work much better).
I also created one to fake iSight camera... same procedure...

Keyboard kext:
http://rapidshare.com/files/36544093...board.kext.zip

Mouse kext:
http://rapidshare.com/files/36544407...Mouse.kext.zip

Camera kext:
http://rapidshare.com/files/36544469...htCam.kext.zip

Enjoy...