Just an idea, not even sure it would work in practice, but writing it down now as my dinner is ready and I will have forgotten afterwards...
My idea is for a game format with 0 days timeout and only a small timebank for each player (say 1 day) at the start, then when white moves, the black clock starts reducing, with this time being added to whites timebank. When black moves, the opposite occurs.
This would encourage fast play, for those that like fast games, just with a slightly different twist - as the chance of the game being decided by a timeout would be decreased slightly.
Something similar happens on uchess with the increment option, this idea differs in that there is a fixed pot of time available between both players so the moves must keep happening.
Just a thought anyway... any views?