I had a 4spd SPI and trust me you are no faster shifting it than you are in drive.
The SCT will do exactly what you need it to do. I had tunes from Randy (focussport) and Wayne (hypillauto).
I liked Waynes he did alot for the SPI and the shifting was alot firmer aswell.
GumpCrew #1 (dismantled)
Trying to get back in, free SVT parts welcome!!