Would be very nice to DECR or INCR at some later time, perhaps as a command option:
DECR MYCOUNTER 1 300
to decrement MYCOUNTER by 1 , 300 seconds from when the command is issued.

Alternatively
DECRLATER MYCOUNTER 1 300

I've prototyped this in the client end (rb-redis, eventmachine), but I think that would limit my scale and if a client died, would lose track.