I know a fantastic guy called Alex, from Redditch that does VW upgrades.
He fitted this mk7 steering wheel into my mk5 Golf to test and got all the button working.
I already had the mk6 MSFW fitted and the old controller wouldn't work.
Had to have new controller, modified wiring loom and a few other bits changing to work.
It is doable though. Have witnessed it fully working in my car!