many times auto fill can really not go your way and you have to suck it up and support for a game. Well what happens when that happens to someone else and they insta lock a different role? it wrecks the game for everyone on your team. This happens so much now and I wish there was a way to punish players more easily without going through the horrible game where you have a troll from load screen. 
Spot on my man, Have had recent experience w/ newbies auto locking and experienced players auto locking! Like if the newb's friendly and didnt know, i let it slide but if they're dicks about it then, yeah, id love a report button for that reason. We should def get this out and try to send a feedback message to riot games. If we can get enough people doing so, then riot'll notice. So many practical situations for a report button in game lobby.
Agreed whole heartedly, we need a report button in champ select at the very least.
It is unfortunate that in order to report a troll's pre-game behavior, you have to sit through an entire match and then do so at the very end. Maybe someone is picking a troll off-meta champion (lelelelel I'm playing Ahri adc!!) or someone is trying to force you to switch roles with them (Hey, I'm in a duo with Player X and you're switching with me whether you like it or not!!).
Maybe I want to dodge so I don't have to spend 20 to 45 minutes with toxic teammates, but still want to report their activity in the pre-game lobby. A report button to flag the chat for review in case someone dodges would be a simple solution to this problem.
Because it would be easily abusable.
Just make a note of it in the report screen after game, "See Champ select chat logs/Refused to take position/Banned my champ" etc.
