In the middle of the game, someone knocked on my door. This was the first time someone had done this and I was happy!
I let them in, but suddenly I thought 'Oh crap, what if they take stuff?'. I didn't have a way to communicate to them (I was on the other side of Groddle), so I had to leave it to good will.
I don't think they took anything, but it made me think, would there be a dialog for '*Member* wants to take *item* from your house'?
Or, when the '*Member* has knocked on your door* dialog pops up, there could be another option for *Let them in, but lock items inside* or something along the lines of that, to stop them taking stuff?