My Canon cameras have a variety of ways you can change their settings to certain specialty ones. You can set a manual white balance. You can set an exposure compensation for regular exposures or flash (to make it dimmer or brighter than the camera calculates it should be.) You can change various shooting parameters (saturation etc.) and how the images will be stored (raw or not, large/medium/small etc.) You can of course switch (this time with a physical dial) from manual exposure to various automatic and semi-automatic exposure modes. On the P&S cameras you can disable or enable flash with such settings. You can change shooting modes (single-shot, multi-shot.) You can turn on bracketing of various functions.

And let's face it, I bet all of you who have such cameras have found yourself shooting by accident in a very wrong mode, not discovering it quite for some time. If you're in a fast shooting mode, not looking at the screen, it can be easy to miss things like a manual white balance or even a small exposure compensations.

The camera already features an option to auto-revert on exposure bracketing, since they decided few would want to leave such a feature on full time. But auto bracketing isn't dangerous, it just wastes a couple of shots that you can just delete later. And it's also very obvious when it's on. Of all the things to consider auto-revert for, this was the least necessary.

To my mind, the thing I would like auto-revert on most of all is manual white balancing. I recently was shooting fast an furious in a plane, and learned after lots of shots I still had the camera in an artificial light balance setting from the night before. The camera can do a good job here because it can usually tell what the temperature of the ambient light is, and can notice that the balance is probably wrong. In addition, it can tell that lots of time has passed since the white balance was set manually. It really should have a good idea if it's out in daylight or indoors, if it's night or day.

And I'm not even asking for an auto-revert here. Rather, an error beep which also pops a message on the screen that the white balance may be wrong. And yes, for those who don't want this feature they can disable it. However, what would be cool would be if the screen that pops up to warn about a possibly bad retained setting, would be the ability then and there to say, "Thanks, revert" or "Don't warn me about this again" or "Don't warn me about this until the next 'session.'" The camera knows about 'sessions' because it sees pauses in shooting with the camera off, and as noted, changes from night to day, indoors to out.

Of course it would still keep shooting. For extra credit if it suspected something wrong, it could hold the image in RAW mode in its buffer memory, and if you ask to go to another setting that only changes the jpegs, it could actually redo the jpeg right.

Now of course, photographers often shoot in manual modes for a very good reason, and they are doing it because they don't want the camera's automatic settings. But that doesn't mean they can't be reminded if, after a longish bout with the camera off, they are shooting in a way that's very different from what the camera wants. That can include exposure. I've often left the camera in manual and then forgotten about it until I saw the review screen. (Of course P&S users almost always look at the review screen, they don't get this trouble.) Again, I want the camera to shoot when I tell it to, but to consider warning me if I turn warnings on that the image is totally overexposed or underexposed. At night it would take a more serious warning since in night shots there often no "right" exposure to compare with.

A smart camera could even notice when you aren't looking at the review screen, because you are shooting so fast. But like I said, those who want the old way could always turn such warnings off.

Another option would be an explicit button to say, "I'm going to make a bunch of specialty settings now. Please warn me if I don't revert them at the next session." This could extend even to warning you that you turned off autofocus. Review screens don't show minor focus errors, so it would be nice to be reminded of this.

(I actually think an even better warning would be one where the camera beeps if nothing in the shot is in focus, as is often the case here. The camera can easily tell if there are no high contrast edges in the shot. Yes, there are a few scenes that have nothing sharp in them, I don't mind the odd beep on those.)