I'm sure you could make a timer circuit with the MS, but

1. You would need to code something, I'm not exactly sure how a turbo timer works but I can bet that there's some kind of sensor that sees when you take the key out (the voltage in the ON/ACC line goes down suddenly) there is nothing in the -extra code right now that does anything like that

2. You would have to include some decent sized fast acting relays which will be needed to maintain power to the ignition wires (the ones that hook to the key cylinder thing area)

Or you could always do without a timer. I don't even use mine anymore, it annoys me. I just chill out for the last mile or so and keep the RPM's low and stay out of boost pressure.