PCS push button shifter - is it fast?

[CFster]

I installed the Sonnax heavy duty 2-3 shift valve, that enables the overrun clutch in 1-2-3, vs. only in 3rd. This is nice, but it's a pain to have to physically shift from OD to D to enable the braking feature (then shift back), especially when you're driving on the road. What about only utilizing the D to OD motion of the push button - somehow integrating that into the paddles, then solenoid shift from there?

I've seen some of your other posts - how can a different converter help with engine braking? I'm interested in tweaking my transmission.

Also, has anybody come up with a way to engine brake with an 80? Like I said I have the 60, but I think it has a Corvette servo in it (Phoenix Trans), so it shifts kind of firm, even with shifts set all the way soft with the Compushift. I was thinking of putting a bone stock 80 in it.