I'm currently using a campy chorus 10 speed shifter with a 9 speed internal ratchet( don't ask, they came that way when purchased off eBay) to run an xtr derailleur on an 8 speed shimano cassette. Shifts flawlessly without the hubjub cable arrangement. Just set up as normal. I may eventually change out that ratchet back to 10 speed and use 9 speed cassettes, and expect it will run just as well.