This is kinda schisophrenic, to put some of settings in manual mode to auto mode, and then still with manual mode wanting other settings to compensate for this mixture. You really don´t know what you want, right?
You can do what you want in AV or TV modes. With manual, you are in charge, you have nothing to compensate, and if they allowed some glitch or stupid customers request of auto ISO at manual mode, than it will be everything messed up.
Couldn't disagree more. M mode with Auto ISO is like aperture and shutter priority. I select the DoF I need and the necessary shutter speed to stop (or show) motion, and I get a metered exposure in rapidly changing light. Being able to apply EC to bias the metering is plus.
Agree with last speaker. This is the nice feature of 1Dx compared to 5d3 (EC). Actually i am using this mode the most.
Missing auto iso on the 5D2, made me dislike the camra at the end.