RE: flying behind the flightline
After reading all the posts this seems like an interesting discussion to me. My club doesn't have the room (both ground and airspace) to have separate flight lines. We don't have any helio guys (well I think there may be one in training), and the field can't handle turbines. I've flown at our field when electric guys have been up with glow planes. Because most of the electrics fly slower than the glows it can make for some difficulties, but communication and courtesy can go a long way. The club had designated one night for just electrics and gliders. The only glow that can fly that night is one that is used to launch the gliders. This seems to work.