With having more than a 100 champions now it would be really nice to be able to quickly find and pick the ones you play the most or best with. So maybe putting champions that you have the highest mastery rank or even having the ability to favorite champions and have them on top in champion select sorta separated for all the rest would be really nice.
There could even be a free rotation section on normal games to encourage people to try champions they don't have.
Also I recently started leveling west and it looks way better when you have less champions to choose from and you don't have to scroll or search for what you want.
[This is what i think it could look](http://imgur.com/a/bB70O)