Vain, for the idea of limiting practice, I really think we'll need assistance from the devs. A system to stop you from driving single player or online on a specific combo (or the track altogether, both forwards and reversed) outside the practice times for the league you have signed up for would be a great addition to leagues in LFS. Ie. signups for a league end say 3 weeks before the first race. Until that time, combos are not disclosed. Then each player isn't allowed to drive the then disclosed combos until that race has passed. You get the just of it. Only sad thing is that the system would be easy to get around but I'm sure something can be worked out making it pretty difficult for people to cheat it and not worth the effort.