Dont know about the different shifters,that sounds like lenco stuff right there but as for a trans brake.....

A trans brake works by pushing the trans brake button and that engages both drive&reverse at the same time so you can rev the motor to lets say 5000 RPM and the car will not move untill you release the button....then your coming off the line at 5000 RPM wheels high,pinned to the seat

BG