We were discussing this on another forum. I also like having a line to follow, but I think that the line should be in chalk or something on the pavement with cones only at the clipping points. That way there are way less cones for people to run into. The cones always get hit by people and pushed into the way and it takes time to put them back in place. There have been a few times when everyone just got sick putting the cones back in their proper places so they ended up staying scattered around the track towards the end of the day which i wasn't happy about because they kept getting in my way.
So I think a think line of chalk or paint on the pavement would be awesome. Like this (but with less cones):