I have built a delta, and i am using M666 to set endstops in firmware.
But S3D will not change the values. I have sent the M666 x-0.8 y-0.9 z-1.2 both manual and with macro, but when checking if changed with M503 it is still set to 0,0,0.
So i have to use Repetier-Host to do the job, there it works..
I havn't tried any other gcodes, there might be more that don't work.