I know Riot doesn't care about Twisted Treeline, but some things need to be addressed.
Yes, we all know Summoner's Rift is Riot Games' poster child and golden boy, with champions, summoner spells, and item cooldowns being balanced around the 5v5 map play. However, Twisted Treeline is unsatisfying to play for a number of reasons.
1.) The main issue is Botting, where people send unskilled, uncooperative "players" into matchmade games just for the sake of leveling up an account. Since the removal of Dominion, the already existing problem in Twisted Treeline has gotten worse. By itself, it wouldn't be too bad. You'd lose a game every now and then due to this, but it's made aggravating by the second problem:
2.) The surrender function in Twisted Treeline is unfair. As it stands a 2-to-1 surrender vote doesn't pass for whatever reason. In most other systems, a majority rule vote is passed. The fact that either a salty, uncooperative teammate, or a bot that never communicates or votes in any capacity, can ruin a game for two other people is simply absurd. If the botting problem is too large a task to effectively handle, I'd say that this change would be the one to make.
3.) Stealthed units/nuisances. Not just Teemo or Twitch, but stealthed traps. The lack of a greater amount of true vision makes going through the jungle a hassle. It's easy as hell for an AP Shaco to cheese with a nest of boxes, or for a Teemo to make engaging or disengaging in the jungle aggravating. While this isn't as critical a problem as the others, and one people will more than likely disparage me for while saying "lrn 2 play", it is still an issue due to the removal of the items Lightbringer and Hextech Sweeper. I suggest giving Oracle's Elixir a return.
tl:dr: either make bots less prevalent, or let 2 people bring the game to a surrender