Roll Control Question?

I don't give a crap about the non existant light because that came out a long time ago.

I also considered using the lock to block the rears, but don't really have any use for it being that way. (I don't know though) I might do it this way now that I think about it more.

Right now the only real use I have for it is to not heat/wear the rear shoes when I want to do a burnout at a light, or stopped.

I also considered what would happen if you set the lock and stomped the brakes.
It would be nice if you wanted to bring the rear end around, but I don't think the master cylinder would allow it to happen due to the piston being solid against the blocked flow to the front brakes.

True?

One other little detail I have to consider is that (Legally) the brake lights have to be on when the line lock is engaged, and I have a 2 stage rev limiter that uses a white wire that grounds to limit the R's to the first stage.

That isn't a problem as far as the line lock goes, as I can make it activate by putting the switch on the ground side and have the hot side be constant on.
This way the switch activates the lock and the 1'st stage of the rev limit at the same time, and I'll need to plumb in a second brake light switch to the front brakes only. (pressure type)
That switch would bypass the one on the pedal and light the brake lights on it's own and both would activate with normal braking. (which won't bother anything)
It will just have one on the pedal, and one on the front brakes also.

So maybe I would be better off using the line lock to block the rears.
This sure would simplify things.
The fronts would work with the backs blocked due to the master cylinder piston for the fronts being in the rear of the cylinder, and the normal brake lights will work with the switch on the pedal.
The main difference would be that I would have to manually hold the pedal, but I do have an auto trans.

Now, if I was holding the brakes with my foot and the drivetrain is under a load from the engine, when I let go of the switch for the line lock is the car going to try to roll for a second until the fluid pressure builds back up in the rear brakes?

If it's possible that this can happen I will just connect it where you set it by pressing the brakes then the lock and when you let go of the lock switch the front brakes let go.