Remove the lock in button please.
How many people have queued up to play, get in and as you call your lane, some one clicks a champ and locks in immediately for the role you wanted?
Then, even if they could take said champion to a different lane, all they say is "sorry already locked"
This is especially bad when a new champion is released, cause for the first week and a half, people take them strait into games and don't know how to play, locking in the moment they can, then again when the champion is on free rotation.
Also consider adding a report option for people who instant lock.