Brandon, this seems like a whole lot of voodoo to me. There are probably 100,000 people actively racing cars, and I bet you can't find 10 who have done what this recommends. If this was really a problem, don't you think you'd hear about it all over the place? Don't you think Biondo and Dedenbear and RacePak and all the other people who make sensitive electronics for race cars put in power supplies that isolate them effectively? I know people who have been running the same delay boxes for years with no issues.
I think this is an electrical engineer who's chasing a theoretical problem, not an actual issue... Just my humble opinion.
As for the "Stop-It", the claim they make is that it will improve your reaction time by preventing the surge. But, the "surge" from the transbrake IS the reaction time, so any effect it might have (debatable) is too late...