I think I wouldn't really want that on my camera (and you most likely can provide the additional CHDK-specific information in EXIF itself), but it's easy to implement and having it as an option won't hurt anyone. It'll also help with my own debugging, so I'll do that.
GREAT
It'll be very helpful for me (perhaps for others, too) for panorama & HDR photos and for the documentation of big scripting sessions.
After a 4 hour trip "in the wild" with hundreds of pics on the card (picture groups for HDR, some freehand panorama-base pics, the resulting pics of 3 scripts with 4 different settings, some pics made for testing new features, a DoF stacking test series...) the whole mess can be transfered to the hard disc and can be classified later, no more hand written notes like "19:01 - script "xxx" with a=1, b=20 c=30"
...and i can write some small scripts to automate some steps, e.g. for renaming, for archiving...
