Autoiso Range mode Set up a #+- of stops the iso can change from selected ISO

[Markus]

A function that I would love was if you could have a auto iso mode that only went a number of stops from the one you set up in manual mode. So you could enable this mode and set a auto iso range in +-stops from the one you have selected. This would be great in combination with a mechanical iris in situation with extremely wearying light.

[nanomad]

"custom" auto ISO causes trouble with manual ISO

[Markus]

Would it be easier to make this work if you set it all up in the menu and then just set the iso at auto iso mode? Like if I set up iso 640 in the magic lantern menu with a autoiso range of +-1 stop? (320-1250iso) and then the auto iso would be restricted to this range? 

[a1ex]

The user interface is not a problem; the backend is.

The bleeding edge (if you compile from source) has smooth ISO transitions and other tricks that would help here - but manual, not auto.