Sorry, but when are we going to get that? I love playing Twisted Treeline, especially after some Summoners Rift games or when 2 other friends are on. But since you can't gain any progress in Champion Mastery, we've been basically avoiding it. It's really sad to me!
Ya its been sad for me too :(
It would be pretty bad, since you can't play against other people
Then again, why don't they just let us have real matchmaking instead of scripts?
ITS 
ME CRAZY
Presumably, the team that made the feature either didn't know TT well enough or didn't have time to make the algorithm for grading player performance. Hopefully they get around to adding it for the rest of the maps soon.
