Shuffle system for matches: instead of fighting a random player, you fight every player in a random order; when you're done, the order re-randomizes.
Summoner spells: during the fight you can cast a summoner spell to help your team; their CD is measured in number of matches completed, so choose wisely when and where to use them.
Item/champion shop: can use gold to buy any item or champion, with a few rules:
The cost depends on market law: the more of that item/champion are already in the game, the more it costs to buy another one from the shop (to encourage diversity).
The cost also depends on your level: the higher the level difference between you and what you want to buy, the more it costs.
Obviously, the lowest cost for a champion has to be higher than what you can see in the random selection (if you want to keep that in the game).
The TAB key opens an overlay that lets you see a summary of each player's deployed team, similarly to the end-game stats.
If the shuffle idea above is adopted, let the TAB overlay also show which players you've already fought (it's something you can keep track of effortlessly on your own, hence there's no reason not to have it in the overlay).
Let us scroll the screen! Seriously, why is it locked? There is no risk of getting lost since the spacebar will snap the camera back to the arena you're in.
