Separate Champion Masteries
For ARAM and Dominion, there should be a separate champion mastery for them, because there are some people who just like to play ARAM / Dominion since some believe that 5s are just too boring and always the same. Thus, this will motivate people to even play more of different gamemodes. Dominion is barely used and I would like to see it more played by the community.
Thanks, CrimsonHabitat