I currently have a set-up in my fortress involving a small entrance filled with traps and a trade depot connected to a moat with a drawbridge. I have an alternative entrance to the depot from within my fortress, so that I can restock while the bridge is up.
The alternative entrance has one gap in which I have placed a door. Now I'm wondering, if I forbid that door, will this stop thieves?
Likewise, I'd also like to know if I link this door up to a lever so that is it open when the drawbridge is up, can thieves open a mechanism-closed door?