A lot of suggestions.
1. Servers which there is no waiting line and everyone is fighting in the background, so there is little or no wait to get to the next match. I'm and not saying to remove the servers with a line, but have a choice for servers to have a line or not.
2. Color changing colors, Possibly a new (and more expensive) type of item that slowly shifts color over time or maybe by other variables such as speed or damage afflicted on or done to opponent.
3. Mods that change how the game plays. Instead of only modders being able to change how the tori looks and what the surrounding are possibly allow some talented modders to change the code in some mods changing how the game is played. Ex. Adding certain feature to a mod that are not in game such as K.Os.