I would play Kaos alot for free league. I like DreamTrance's league although it consists of set games per season, so you cant play a league game whenever you want (which many people want).
I really think TUS should have its own seperate league for Kaos now, the scheme is popular enough for it. It's also entirely unique, this isn't like asking for an individual scheme from the classic league, Kaos really is in a league of its own. Not only does it deserve it's own league, it requires its own league. TUS would gain many new users as there are many Kaos players who want to play it for a league whenever they like. Being able to register and start playing whenever they like. Not only would TUS gain more users, Kaos would gain more players as more and more "classic" players discover this scheme and realise its depth, strategy, creativity... and fun!