I cant see why it would be against the rules if the purchased part or whatever you built followed all the part rules and the flow chart. I don't think they are that "Exotic" and as long as your following the electrical rules, you should be OK. The only question i could come up with is if they could handle the current and gauge requirements.
Honestly i think they are a great idea. I would love to see them used on a robot, Maybe ill make my team use one next season if they are required
