No, I only put 1 down for the room. I do use the locks.
For people that misplace their keys - do they rekey the electric code so the earlier key won't work? I'd be more worried that I was leaving my key all over the place because keys are meant to allow access to things/places you'd like unauthorized people to stay out of... Psychological barrier maybe? Maybe a badge pull and binder clip to attach a key card to the inside of your bag would help.