I believe the switch closes to ground when actuated. Disconnet the connectot, put an ohm meter on it, and actuate it, I believe you will find this is the case. It has been a very long time since I messed with it at all, especially since DSMlink uses the upper switch, which may be different, so I reserve the right to be wrong
You definitely want to unplug it before testing it though, since it pulls the ECU output to ground, which can be confusing for most poeple (more used to putting 12 volts on something with a switch, not ground).
Back to the switch idea, I came across an example of this at the SO. Joe Bucci runs something like this in his mid 10 second 14b/16g powered FWD 1g. The switch is on his steering wheel, and he can hold it as long as he thinks he needs to. In this case it can work, since your hand is on the wheel anyway. Interesting solution.