I remember back when I first played Dalek Mod (Update 46 - well I think it was anyway) and there was a model just called 'Police Box'. Basically it was just the default TARDIS exterior, and all you could do was open the door. I know it sounded pointless, but I think that if it was added back, it'd make a nice decoration piece. For example, if you made a town in the public server, you could set a police box down on a street corner as a decoration. You could even add a feature to it, like it could be used as a storage device, or it could be bigger on the inside, but not be able to travel (or it can be moved using Stattenheim Remote, so it acts like a big backpack sort of thing).  Anyway I think this would be a good feature for 1.16.