I'd just like to get rid of lane courtesy for warm up. Maybe if people got used to that, they would realize that they don't need 4 lanes during league. Even more so, many people are WAY too slow and deliberate during warm up. Some people get up on the lane, stand there, fiddle with 3 different things, and then concentrate on their line like they're going for their first 300 or something. Nothing like taking 45 seconds of time just to throw one ball that probably won't even find the pocket. I actually pray that they'll strike every ball of practice so they don't have to go though the entire ritual for the spare as well. It's practice for goodness sake. It's for warming up and finding where the oil is. That's all. It's the really slow ones who keep others from getting more than two or three shots.
I do agree with some others. I've never had a league do shadow balls, but it's a great solution. Throw one ball at whatever you want - pocket, corner pins..., then get off the lane for the next person. I always shoot at least one 10 and sometimes a 7, but I do what Charlest suggests. First shot at the 10, second at the pocket. Or if I leave an 8 pin or something, rather than shoot at that, I'll aim for the 10.
The ones I really want to smack are the ones who want an extra shot. The first person will leave a few pins and tell the second to either shoot at them or rerack. The second person shoots the spare, then actually wants to get his entire next frame because he doesn't want to count the shot he cleaned the other person's spare up for.
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Telling it like it is.