If there was an insanity meter I am quite confident there would be no margin for error left, meaning nobody would ever hit madness levels at all, meaning there was no point to the entire system as it was designed.
I understand the DESIRE to want to know everything. But madness is all you NEED to know. When you get it, do something to take it off. As for the micro-managing to the very last detail to ensure you never get it in the first place, it will quite simply never happen. Just like witchcraft, I will adjust, tweak, and mess with insanity as soon as I see players creating 'solutions' that i deem too easy. You ARE intended to get a madness level every now and then because you cannot quite figure out how it works, and there are already way too many lenient options in place to reduce madness.