Riot, do you have any plan to support Twisted Treeline?

They don't use TT in pro-play so why would they support it?

is twisted treeline supported in 3v3 ranked?

Twisted Treeline isn't in danger of being removed. They've said this many, many times.

I just started playing Twisted Treeline again after Dominion was removed and the map is just unbalanced in general. Way more problems than Dominion ever had. 9 times out of 10, the team that gets the early lead will win the game, regardless of how long the game lasts. Games are pretty much won at champion select. I hate that Dominion is gone and this unbalanced, snowball-heavy map is all we have left in its stead.