If it is not allowed to carry weapons, then yes.
No, you can't take gain charisma with it being at 10, you can take 9 charisma and magnetic personality though.
hmm, btw beer gain +1 CH, but don't know, would it works or not over 10 CH.
Well you can do that, but it's totally useless like it doesn't add any slot (followers or in your party) ;pNo
Maybe you blocked the way somehow. For example you were staying at door for a long time. The message "You better move" appears when you do that.