Can one "mix" AM FM and XM stations in Favorites?

It would be convenient to be able to have Favorite stations regardless of origin ie AM/FM/XM side by side. But alas it seems that one is unable to do this?.

You know what else would be nice?

The ability to disable a band altogether.

I'd rather not have to press "Band" twice to get from FM to XM - AM doesn't have anything good around here, but I don't want to disable it with VCDS in case we're travelling and need some weather info or something...