I think that it would be cool to have Ranked Time controls and have different ELO categories for each time range.
ex:
- 0.1-1 second: Blink
- 1sec-1min: Bullet
- 1min-10min: Causal
- 10min+: Strategy
Think Chess.com levels. This would let people like @ColdDayz and other long players shine while not discrediting players who can get 20k in a lot less time.
While this would be very good for ELO rankings, It would likely take a long time create Lobbies, this would likely only be viable if the game continues to grow.