I've got more emotes I want to use than can fit on my emote wheel, so I was thinking of how I might be able to use more in an individual match. I've seen the suggestion to have a random emote option, or saving multiple emote sets you can select from in champ select. This brought me to the following idea I'd like to propose;
Emotes as slash commands. In other words, you type forward slash / followed by the name of the emote, and hit Enter to use that emote from your collection!