1) I'd say you were correct, they're really not that popular within the community, but also...
2) You could use the freeware "AI Flight Planner" (available from Avsim) to program some routes, or if you want them to be more random, you could use the traffic tools available within the FSX SDK (all files are provided, you just need to add the Ultralight to the aircraft list and compile them...)
Either way will work, but AI Flight Planner is probably the easiest.