This is a good idea that I wish more parks would implement, especially on the more popular coasters and rides.
One related problem I've had, though, was at Geauga Lake (when it still was) - I wanted to go on a ride that was like a Trabant (don't remember the name), but since my husband gets ill on circular rides, I wanted to ride alone but was not allowed by the ride op, even though the ride only had like 6 people on it, no joke. That really annoyed me, that you MUST have more than 1 rider - while I can understand it for crowded days when the lines are long, come on, it shouldn't be a full-time policy. Granted, I've never seen it before or since (never been back to that park yet, either), but oh well.
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html