Locking the revo in 2nd gear to use motor braking/reverse

[gtxracer]

Right, but part of the reason the one way in in the there to begin with, is so your nitro engine can "coast". Ever see how your truck rolls back after you let off the gas? That's the clutch and the one way working together to allow your drivetrain to spin freely in reverse.

It might work, but I think you're going to have problems. I know it will be more like a 1/8 scale center diff setup but since it's an actual transmission, you might see more carnage.