GTN 750 integration with RSG G500

[daemotron]

I have played with the GTN configuration to see if I can improve the integration with the G500 to a similar level we see in the BN-2 Islander. So far I managed to see the whole flight plan from the GTN drawn in the G500 by modifying the RealityXP.GTN.ini file:

[GTN_750_1]
... stuff that's been there already ...
MasterDevice = true
LinkHsi = true
LinkCrs = false 
LinkObs = false 
LinkVor = false 
LinkOto = true
LinkSimGps = true
AutoNavGps = true 
AutoCdiSrc = true

What doesn't work yet is having the CDI show the correct course (LinkCrs didn't work, nor did LinkObs, so there must be something else). While the GTN is in GPS mode, the G500 blocks the course selector, so it also can't be adjusted manually by the pilot. Maybe @Coop could point us in the right direction here.