The way I did it, re: hdg, alt and crs adjustments, was using FSUIPC commands. I would turn the desired hdg knob clockwise and assign it to rapid increase hdg, by tens as I recall. Then, using same knob, rotate counterclockwise and assign that input to decrease hdg slowly, by ones. So, if I wanted to turn right 45 degrees I would turn the knob 5 clicks clockwise, (50 degrees) then back up 5 degrees by clicking counterclockwise 5 clicks. Not 100% real but it worked and only used 1 knob. Hope that makes sense.