OK, here goes again. I'm pleased somebody actually saw it existed the first time though - I don't doubt Michael's word that he didn't delete it, but it cearly existed, so there's a glitch somewhere!
When I first heard about digital cameras, I assumed the standard ISO ratings would go out the window - or be available as an option to those who wish to stick to them before making the full transition. People have suggested ISO bracketing, but still in the standard terms of 100, 200, 400 etc. If I'm out wildlife or people shooting with a 100-400 f4.45-6.3, and always want it as wide as possible for the given length (and so set that as default), I should be able to program the camera to not fire below 1/125 (my tolerance - about 80% of shots are acceptable), and to choose the ISO itself according to the exposure required. Current camera 'thinking' means it would choose eg ISO 400, assuming such programming options existed. But why not ISO 324 if that is the lowest it can manage? Or on another shot, why ISO 200 when ISO 136 works as well? I'm assuming there is a (changeable) default to make the ISO as low as possible. ISO bracketing could then be done (if desired) in chosen increments from the ISO chosen by the camera - eg 50 above and below. It might also be that I could choose a threshold for ISO - not below 800, for example. Sounds slightly complex to have to tell your camera these things, but for most people's style of shooting, it's probably only done for each type of shootin g- if you're off shooting landscapes, you set it for the day or trip once. Then you go back to your Shooting Style 2 (codenamed 'Candids') when in people mode etc. Once programmed, a simple change is all that should be required.