5R - any way to default A/S mode to auto ISO?

Hey guys,

One annoying thing I've found with my 5R is that it seems the ISO setting is always shared between the different modes - or at least between manual, aperture and shutter mode.

I find this annoying since I usually want A/S to be in auto ISO and every time I do that and switch back to manual mode it defaults back to ISO 100 - usually resulting in a completely black screen.

Is there a setting that I'm missing that allows the different modes to remember the last setting they were used in or is this just something that everyone has to deal with?

Thanks.

-Jon