Make it so Skeletons can shoot through the door as well, and Creepers can explode if it's only the door between you and them.
Can't they do that already?
Depending on a glitch Skeletons can lean against the broad side of the door and shoot through the top block due to the area the skeletons arrows are spawned (above them) which is why they can't hurt you in 2x2 walkways. But I mean if they see you through the door at any angle they can shoot an arrow into your face while you punch them.
Mixed opinions on this. I like the idea, but ill miss the easy killing of them when there standing infront of my door.
So, in short yes.
Can't they do that already?
Depending on a glitch Skeletons can lean against the broad side of the door and shoot through the top block due to the area the skeletons arrows are spawned (above them) which is why they can't hurt you in 2x2 walkways. But I mean if they see you through the door at any angle they can shoot an arrow into your face while you punch them.
Creepers blow up if the door is opened.
with default textures, they can't.
I think the way how their damage is coded will make it hard to change, if it is based off of the texture as it seems to be.