Right that habit of people, to roleplay battling most bloody and brutal inside that bar as if it was some underground fight club, completely ignoring the bartender, who most probably wouldnt really watch and enjoy people killing each other and wrecking her furnitures, as well as completely ignoring a guard and its commander right outside the door, at some point simply made me not going there anymore at some point.
This place is just no bar. And that type of roleplay, which happens there almost constantly, is just a pretty poor nonsense lacking common sense and/or imagination. I may certainly sound polemic, but considering that people acting like that are meant to be roleplayers, I doubt even an NPC standing in front of them would bring any change - unless they would punish them instantly;)
I have one more suggestion: Why not placing one more pub somewhere, a more real one, then Kada Els could remain frequented by the guys narrating their superpowers (=RP fights..), while in the new pub peasants could take a drink without getting spilled with blood and occasionally being hit by a devastating misguided dark way spell?
However though, your suggestion to place guards inside has the undoubtable advantage that people always had to face it as it is meant to be - I like it!
edit: psst had a typo o/