For future referance.
Main ingame menu -> Set up --> Options
Choose "mouse buttons" (at the top)
1= mouse click cylces through all four states (contract/extend/hold/relax)
2= mouse click only cycles through the 2 neutral states (Hold and Relax)
3= mouse click only cycles through the 2 action states (extend and Contract)
Note: Substitue 'extend' and 'contract' with 'right/left bend or 'right/left rotation' where applicable for specific joints