Starting Case 580CK in gear

I just bought a Case 580CK with power shuttle that grinds gears. Is there any way to jury rig it so that the tractor can be started with the gear selector in any gear and not have to be in "S"? Is there any basic things I can do to minimize the grinding (like adjust the clutch) before I really have to tear into the transmission? Thanks.

Starting Case 580CK in gear