Thanks for considering it, I think it would be really neat and people would certainly use it :) Mostly when I was new to your mod I would find myself subconsciously trying to enter the shelter because I see the door :P
But yes I totally understand it could add some unnecessary complexity and a few hundred extra lines easily. Especially when you have to consider your probably going to now add an invisible car to the entity and have to account for if someone marked the shelter for deletion with a robot with someone in the shelter among many other scenarios to account for if I had to guess with my 0 programming knowledge but in any case thanks for entertaining it!
Maybe someone will make an expansion pack to do it :D
