Allow players to specify preferred speed
One problem that came up in the games I've been in was a few players signing up for a "Daily" speed game but not being able to post every day. This led to them feeling like they weren't keeping up enough, and leaving the game.
I'm not sure players really pay attention to the speed settings on the game pages, and wondered if there might be a way to call it out more. One thing that I thought would work well is if a player, on creating their account (or for existing players, the next time they log in after this is implemented) could set their preferred play speed.
Then, when they see a game and submit a character for it, the page could warn them in some big, obvious way if the game's play speed differs from their preferred play speed. They could still sign up for the game if they wished, but they've been warned, then.
(Also, the narrator should then receive a note on the player's character submission notifying him--in similarly big and obvious way--that the player's preferred speed differs from the speed set for his game. He can still accept the player, but he's been warned.)
Basically, just a way to make sure everyone knows what's expected on signing up.
Players are now able to set their preferred game speed in their profiles and can use this information to filter games on the Looking for Players page.