I thought of something that could improve the league's cohesion and unity.
Rules change:
For each choice, either opponent can choose what league, and game.
Thus, you could have opponent 1 choosing RR, TRL and the other opponent choosing Battle Race, Free league. 1 game played of each pick. It's not in the rules, but it should be allowed.
So if ever I really want to play battle race I can also play a classic league scheme with someone who wants to play a scheme from a different league. You're not limited to playing in only one league, so you're not limited in your options of challenges to the other player.
It'll be good for the community
and help grow the community!