The only way you will possibly impose any rules in pubs is to have an army of bouncers, and most pubs can't afford such, once some folk get drink down them their not going to listen to anyone. We have inherited armies of jobsworths over the last 4 months, telling us were to go, were to stand, when we can go in, try that in a pub after a period of drinking and..... The only practical thing one can do is keep the pub as clean as possible during opening and after, other than that your flogging a dead horse.