Hi.
The mk6 < and > buttons communicates through BAP as far as i know. If you code the RNS510 with BAP you will lose NAVI on the MFD but the < and > will work with it. If you use DDP (disabling BAP) they will not work but you will get NAVI on the MFD.
In the meantime i had the mk6 MFA premium cluster installed which works flawlessly with the mk6 mfsw. Can def. recommend it!