Tracks can impose reasonable safety regs on their own that aren't IHRA or NHRA. A rule that insures that the car can't lurch forward during cranking or starting (similar to having a neutral safety switch which I believe IS REQUIRED) is one that I believe should be inforced. OEM has had clutch safety switches for at least 20 years. And I'm sure there are different opinions on starting in neutral, with the clutch depressed or not - some people don't like the extra drag of the input/countershaft spinning in (cold) gearlube on the starting system. Personally, I never believed the dry bearing - thrust face theory - I've never torn apart a running motor that didn't have residual oil in the bearings. As to your post on how to install the switch, if one wasn't OEM, I usually install a switch to interrupt the ground side of the start relay, like OEM does with the neutral switch on autos. You may have to fab a bracket.