[Phantom]

You can keep reverse but you have to place the freewheel clutch between the engine and trans. The down side is if you need the engine to slow you down it can't, that can be fixed if you get a locking overrun clutch (I think that is hat it is called maybe a sprag clutch check wiki). I believe the two other issues you can run into are noise and shock on the clutch. The shock would be if you are coasting and suddenly need to speed up as the engine will spin up quickly till it hits the speed of the clutch then it will have the sudden transfer of torque. I'm not sure how bad that will be but if the parts are strong enough it should be able to handle it.