Yea, you can bribe the floor sometimes, some people are bribe-able in life and some aren't, I've never done it but I've heard of others doing it. It's frowned upon, so if you see it you should complain imo.
For the waitlists, you need to show up before they happen, or wait until they get smaller. So go early, or go late. Otherwise just take notes on the waitlists/games or try to bribe the floor yourself... Or go to another casino that doesn't allow that behavior.