I definitely vote for this one. The way my character works (and most others I presume) requires him to walk around with his weapon put away for most of the time.
Other than for roleplaying purposes, think about it this way: Would you walk around with your weapon out all the time, or tucked away in it\'s holster when you can? Not even soldiers walk around with the weapons out unless ordered to. It\'s simply too hard

(which again brings another wish to be linked with this: Walking around with your weapon out might make you more fatigued than otherwise, due to the extra strain on the body)