1 thumb button for push-to-talk, 1 for my radio
middle mouse button for additional radio
1 index finger button for compass, 1 for sprinting, 1 for 3rd/1st person, 1 for ace interact and self ace interact
1 middle finger button for medical menu, 1 for climbing, and 1 for prone/kneel/standing.
If I had to chose five I would do PTT, radio, 1st/3rd person, compass, and medical menu, with middle mouse still being transmit SW Additional