Hotkeys for Map Overlay Opacity

Is there a hotkey for map opacity? I'm not aware of one...with that in mind, if I'm wrong, please let me know.

This is a minor thing that drives me nuts, usually just between maps, but occasionally within them (IE arsenal).

Some maps have a LOT of stuff on the overlay. It blocks your vision, so you have to lower opacity. Other maps have next to nothing, and you get lost without the full opacity. It involves opening the menu, messing with the slider, closing the menu, and clicking the save button. That's a little longer than I'd like for some of the more difficult maps where one of those devourers can pop up and insta-gib you.

I'd like to suggest a shift-+ and shift-- (shift-plus and shift-minus) hotkey for map opacity. This seems like one of the most common reasons to go into the options, and it'd be nice to not have to do this.

A hotkey for always displaying loot would also be welcome, if that does not exist. I find myself wanting to toggle loot on and off a lot while grouping in short allocation groups.