When somebody knocks on your door, you get a message in the bottom asking whether you want to let them into your house or not.
Given the number of players who are in the game already is just a fraction of the total Glitch hopes for, this sort of thing could happen a LOT in the final version. In fact, it could even become a way of spamming or DDOSing a player... a form of bullying within the game.
Could there be ways to set your door-answering-preferences to include, say:
1) I don't ever want to answer the door (an away message)
2) Always let my friends in when I'm offline/online
3) Lock the door to everyone, but tell me when they knock (as is currently the case)
4) Lock the door to friends, but tell me when they knock
Most of all, I'd like the ability to RETURN to my house if somebody knocks on the door. A sort of teleport, to one place, in one particular circumstance. It would also make the positioning of your house pretty useful in a new way.