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Would it be possible to add the estimated DOF value into the viewfinder for a given focal length, aperture, and subject distance? This is assuming the lens is able to determine the estimated subject distance. I know that I've seen distances in some of my EXIF data, but I don't know if all lenses record this info. I think the feature would be most useful in assuring adequate DOF when using lenses with large apertures such as the 85 f/1.2, 50 f/1.2, 135 f/2, etc.

Referring to the Canon Rebel, XXXD, XXD and 5DX bodies...There is a significant issue in not being able to dial in EC in Manual mode while using Auto ISO.

The name "Manual Mode" is a misnomer. It is not only used when the photographer wants to control each individual setting. It is the only mode that allows the user to determine the shutter speed and aperture while still taking advantage of the automation that modern DSLR's have to offer, via Auto ISO. Unfortunately, it seems Canon has overlooked the fact that their users aren't allowed to fine-tune exposure in this "Manual" mode, which is ironic in and of itself.

While using Av, Tv, and P modes, the photographer can dial in EC and the camera will subsequently adjust the non-user defined settings to expose for the desired EC. However, there is currently no way to achieve this unless the photographer wants to manually adjust shutter, aperture, and ISO simultaneously for each individual shot. Under consistent, constant lighting this is not much of an issue. Unfortunately, any situation with varying lighting renders Manual Mode essentially useless. For example, let's say you are shooting a school play with varying stage lighting; adjusting aperture, shutter, and ISO as quickly as the light or scene changes is not feasible. Some may argue that Av or Tv mode would be suitable in this situation, however, these modes can be just as restrictive when trying to achieve a desired effect.

Is this something that could be fixed on a software level?