Nice process! For those who are looking at T56 of any version, YES YOU WANT THE REVERSE LOCK OUT!!! the shift pattern on these is so tight that without it, you WILL hit the reverse gate on the 4-5 upshift at least once, if not multiple times. First time I drove a T56 in a Dakota (not my truck) I hit reverse gate and mashed syncros together at least 4-5 times in the first 20 minutes before I trained myself how tight the pattern was and could shift without hitting reverse gate.

It's really a simple feature to keep.

I have mine wired to the brake light circuit. step on brakes, the brake lights illuminate and my transmission can shift into reverse.

Could use a button/switch but under what circumstances are you going to be stepping on the brakes during a 4-5 UPSHIFT? that's like stepping on the gas pedal while trying to slow down. Having it tied into the brake light circuit makes it very intuitive, and easier for another driver to figure out if the situation ever arises where someone other than you has to drive your car.