If that reverse block off is ever needed to be reaccessed, simply drill out the pop rivets, remove the plate, do your thing, and reinstall the plate.
And there you have it! The T56 is now sequentially operated. Did I mention it is totally cool?
You might be wondering about the clutch. Since nothing has changed inside the transmission with respect to the gears or the synchros, the clutch still needs to be used for gear changes, both up and down.
S1 does provide a strain gauge-equipped shift knob that could be wired into your ECU so that you could do throttle cut / flat shifting, but you still would need to use the clutch. A real sequential transmission has a lot of stuff inside it that makes the magic happen. This is still a traditional H-pattern shifter, but it has a black magic-equipped adapter that moves the shift arm inside the transmission through the same motions. It’s quite fast to do, and very easy to get the hang of, but don’t try to rip through the gears without using the clutch, or you might actually rip through your gears. Know what I mean?
And here is your sequential moment of zen: