Major
MacBook 4,1 breakthrough:
Internal and external
USB fully working: Trackpad (with functionality as with MacBook 5,2) and keyboard and both USB ports are now up and running!
No Teleport tool or screen sharing needed any more to access the machine and audio, wifi, IR remote receiver, framebuffer (144MB intel x3100) working now. Not much else to desire now (except the OpenGL speedup).
All in all, this machine is very much usable now, with up to 6GB RAM and a 2,4GHz C2D. Not to mention my other hack (external GPU via mPCIe) that in addition brings full graphics acceleration even to this macbook. See
https://forums.macrumors.com/thread...-1-and-up-with-pcie-expresscard-slot.2135898/
Hint: Took some kexts from the USB beta kext package by OSXHackers...
Details on which kexts did the trick with kernel cache precompiling on another machine will follow shortly.