The Clearing bonus is actually leaving the room ( even if you dont have a key ). I might add the full regeneration later but I already tried to add more potions to the game on 0.83 and I want to see the result first.
I tried more deterministic spot for muncher's trap ( & bat>vampire spawn ) but I was disappointed by the result. I just ended up thinking longer and I guess that's what you were talking in your 2nd point. This Analysys Paralysis thing was very interesting and I will keep an eye on that, I think that a bit of randomness can someone help people who take too much time calculating everything.