I also like that it allows you to set a fixed EV value in Manual Exposure mode, so that you can spin the front dial to change the shutter speed, and the Aperture/ISO will change to keep the exposure constant. DualISO is great for my very high dynamic range aviation shots, which can't use traditional multi-exposure HDR techniques. I use ML on my 50D, although the HD video is nice, I got it mostly for the stills features it offers.

The m/sRAW settings interpolate sensels together, they do not crop, so although the resulting pixel count is smaller, the field of view of the image remains constant. As you have to keep all of the data from these sensels, and the ajoining ones, in camera RAW cropping is not possible. There are additional masked sensels around the edge of the frame that are necessary for the demosaicing process, as well as some that are used for setting the black point, and black point compensation.

This is true even for the 5DS/R when using the cameras in built crop mode. Actually if you shoot RAW any form of crop mode is simply pre applying a crop to the full sized RAW file anyway. 'Digital Zoom' for stills is simply pointless, just crop in post.

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