Ask Riot on "Auto-fill Trolls" got me angry...
Instead, we’re more likely to make a system that lets you give us feedback after you dodge on why you didn’t want to play that game. [...] Feedback like this could help us spot dodge trends, which could then lead to new features or solutions around those trends. Player Behavior has a few high-priority things on its plate at the moment, but this is definitely something we want to circle back on.
In the meantime, you’re still able to report players who are assigned a role but refuse to play it in-game, since the expectation is that players will at least try their best.
I really really hope that these other "high priority things" are really good. Because, "in the meantime", we are NOT able to report a player who is assigned a role and refused to play it when someone dodged the game entirely. And who would blame the dodgers? I mean, I should NOT have to play a terrible game to its end just so I can report an ass-hole. Even more, FOUR DIFFERENT PEOPLE should not have to suffer just to report ONE ass-hole.