Of course there are those people that don't think it is and if people don't follow it once somebody tells us we take care of it and they will start honoring it.
You pretty much answered your own question right here. Not everyone is going to abide by the rules, when they don't, you slap them on the wrist. They do it again...you're the ref. I'm sure you guys can handle it. There really isn't much else to do to make people do it "right."
The only thing I can think of that might help is from the one time I surrendered. Only time anyone ever called it on me. The person ran up behind me(night game) and put their hand on my shoulder and said "surrender." Maybe make a rule that you have to tap to surrender. If you can't tap them before they realize what you are doing then you are both dead.
Skeptic are you talking bout me?
LOL. That's what I thought. Honestly, I'm with you on this whole ordeal. I've never played at Vanguard though, outdoors only.