Don´t worry soon the next Update for the Official Release will come.
Like Tiank already said, you can do such things:
-You warn your enemy/ally to stop trolling
-You press "reuturn to lobby"
-You ban the player (so he cannot rejoin with another name easily)
-You wait around 5 seconds to get one player (in official relase, there are many players that want to start a game as fast as possible, I think)
It doesn´t solve all kind of trolls, because you can just troll like people do in cs go. They join with one friend, so the vote for kicking never work. Same thing in kam if there are 3 players for example, and you just joined a random lobby and they are trolling YOU.
However it should solve most problems, because Trolls will "loose" their time also (Not happy, because the trolled people don´t care
)