Hello Riot and Everyone,
I've long wondered as I am picking champs, since I own all but 5, about a custom sort menu. Much like the champion or skin tab, where you could sort your champions into 10 different groups for example, similar to the functionality of masteries and rune pages.
With this system in many games you would be able to fill that niche role at the last minute. For instance I'm middle pick and all of a sudden I know I need a jungler, but I'm not sure which one I want to play. If I could have a jungler tab that I could hit and then it pulls up everyone that I personally selected as junglers I play. (I could put all or just the ones I am comfortable with).
I think by sorting tabs like this, you would ultimately get a better picking experience and wouldn't feel so rushed to pick your champ from the role you needed at the last minute, given the shortness of que times. Furthermore you could even have tabs for just favorite champions, potentially this page could be further modded by riot to automatically select one of these at random if the player is afk and the list contains greater than 20 champions.
I'm not sure if Riot was planning on this customization in the future, but it seems like it would make champ select a lot less clunky, scrolling through the 95 champs that I own.