Currently there are only 3 variations for these pipes; 256, 128 and 64. I would like more variations in the following flavours: 24, 32, 48, 96. Oh, and please, PLEASE, recompile the model with the addition of this - $origin 0 0 0 270. Otherwise I shall have to eat your face.
maybe some pic-y-wics to show what models you mean? anyway, I'll give it a shot if I'm not too busy tonight!
Anything shorter than 64 seems strange to use because it is unlikely they would use such a short segment when running pipe. I'd almost say it would be better just to make a "flange" prop of the three rings and then you can just embed a longer pipe into the wall and slap that around it. However I'm not sure how the lighting would turn out (even with per-vert).