I am not saying this is a good idea as it stands,
but rather I am throwing it out there as a thought
experiment to see if someone comes up with a better
variation.

For comparison, let's start with a 40/120, D/60 time
control with a USCF-Style delay of 5 seconds.

Replace the USCF-style the delay with a Fischer increment
(meaning 5 seconds are added to your clock when you hit
the button rather than the clock waiting 5 seconds
before starting to count down -- the difference being
that with a Fischer delay you can gain time by moving
quickly).

Now replace the 40/120, D/60 with SD/10 or SD/20, but
with the Fischer delay set to 3 minutes.

This, of course, wouldn't make matches end by the next
round, but when playing a club game or a game at work,
it would avoid the rather artificial "race until the
time control changes then relax" effect.

--
Guy Macon
http://www.guymacon.com/