1) This exists in D&D already and is known as passive perception. If your passive perception is high enough, for example, an illusory wall would either never show up or you would instantly see through it and discern it is an illusion. It is also made clear in the rules for illusions that you still need to interact with an illusion despite this passive perception but considering Larians stance I would also like to just see it implemented in some way.
2) I would also like to see the option for disabling it entirely.
3) I don't think characters should auto path perfectly by default. I support it's inclusion but would greatly prefer it to be a toggleable option.
4) No thank you. I don't think adding any more intrusive mechanics to be a good thing. If anything is added in this regard it should be an option, not a default feature.
5) Unfortunately Larian has already said they will only include PHB material but I don't see why not.
