I let a friend "play" with my 7D and he changed so many parameters that I ended up having to revert the camera back to its default settings before I could set it back to the way I want to use it.
However, this brings to mind two of Canon DSLR default settings...
I would think that more photographers would rather have their DSLR set up so that it will not shoot without a card, rather than having their cameras set up to be able to shoot with no card installed (and not capture any image).
The Canon Gods must have a different opinion since the default for Canon DSLR camera is to be able to shoot without a card installed.
That is something that I always change automatically as soon as the battery goes into a new camera.
The same thing goes for when I select auto exposure bracketing. In the camera default setting, the AEB will automatically stop working when the camera is shut off or when a battery is changed.
I may be a different breed, but when I turn something on, I prefer to be the one to decide when I want it turned off. Of course, I choose through the menu, not to have the AEB stop when the camera is shut down. However, IMO, that should be the default setting.