Thanks guys. I actually bought a spare clutch switch so I could play with it and verify its operation so that I know for sure the modification is safe and effective, and I thought others would benefit from this information. As @whats77inaname pointed out, a remote starter that can use a relay to temporarily "short" pins 3 & 4 of the clutch switch can remote start a 6MT that wouldn't have otherwise been possible. I had contemplated the remote starter at one point and that was indeed one of my motivations for performing this mod.
I'm not sure how easy it is for thieves to hotwire and steal these modern cars with smart keys, but another idea for a theft-deterrent feature is to use a toggle switch to turn off the 12V (signal 3) going into the clutch switch. Without +12V, the clutch switch cannot send the "clutch depressed" signal 4 to the CAS, and therefore the engine cannot be started.
