no cash, no rules
When there isn't any cash or moving ahead in a tournament on the line I don't worry too much about rules. An example, a bar with one nine footer, the rest bar boxes. The nine was a very ratty old Big G but it was the only nine I knew of for many miles around. The owner and I had a bit of an unspoken agreement since the first time I came in, I practiced free, I contributed very generously to the tip jar. Everybody was happy.
On the table for "free" I didn't feel it was right refusing someone wanting to play with me. One time a man came in with his fourteen year old nephew. It was a small town bar. The kid wanted to play and I obliged him. Just banging balls, but things got funny when he knocked a ball off the table. He picked it up and threw it on the table as hard as he could saying, "Around and around she goes, where she stops nobody knows!" Oooooh taaay ... I resumed normal play. Happened a few times as his uncle watched closely. I doubted the kid was spending much time in bars or pool halls yet and I figured he would learn when the time came.
I have never called double hits and illegal shots on people unless they tried to scoop the cue ball. Then I explained to them why not to for the protection of cloth.
When I managed to get someone to play snooker with me I never bothered explaining the rules, never took points for missed balls. They struggled enough on the table, confusing rules would have just further discouraged them and it was nice to have somebody else on the snooker table with me sometimes.
If somebody is on the table to have fun I try to accommodate that. We need more players and taking the fun out of the game isn't the way to get them. If they get interested in pool they will learn the details soon enough.
Hu