This could also be applied to normal games - preferably all arenas, but would benfit most in 5v5 ranked or dominion.
The idea is very simple.
When the option to switch hero arises, a new, 'Kick' option should appear.
Let me set the scene.
Solo top irelia - nice
Mid cass nice
jungle gp nice
ad carry ashe nice
last pick - "i wanted to play irelia, **** u, i am afk in game now" picks ap caitlin to troll.
Now clearly, no-one wants this guy on their team. Vote 'Kick'. A player receives four votes, and he gets booted, and the result is as if he left during champion selection. He has short ban duration (too short he will just return, too long and players that get booted by bully premades, won't get in to game'
This way, its less likely of going in to game with a troll player. Let's face it, we all know how frustrating it is! Come on riot!
Ok, some cases may occur where people who souldn't be booted, might get booted. BUT the number of these will far out weigh the instances needed for an actual kick out. Less chance for that 'gg' in hero select moment and someone feels they need to leave because of this one ****** bag!