Hallo amusi,
All combination with the "Draw Mouse Botton" are already possible.
When the RMB is the draw mouse button these combination are possible
MMB (down_up) LMB (down_up) MouseWheel (down_UP).
The "ROCKER" - Gesture is NOT possible
(when RMB is draw button you can NOT use LMB and hold RMB click )
By the way I want additional draw buttons too but Jeff says it is not so easy as it seems ......
with best regards
Leo