If there's a few of you who want to work on this, I'd suggest making an SVN or git repository somewhere (you can create a space on assembla where CHDK is hosted, for example). Alternately, I could throw the current "latest" in the CHDK SVN (but not in the autobuilds) and you could post patches as needed. I'm happy to do this if you find it helpful.
...or was it capt_seq_task? 
I'd guess that as more likely, exp_drv_task should only do the "extra long exposure" stuff, while capt_seq handles normal overrides (as well as raw, bracketing and a bunch of other stuff). There's also some interaction between the modemap, camera.h defines and bracketing/overrides.
