I'm a big fan of your keyboard shortcuts, they make live easier and working with the board faster.

So:
Suppose that I have two Quick Filters: "A" and "B".
"A" is turned ON and "B" is turned OFF.

I now want to switch to "B".

Instead of turning "A" OFF and turning "B" ON by myself....

... I just can (for example) Shift-click "B" (pressing Shift while clicking) and as a result "A" is automatically turned OFF (of course by that I mean automatically turning all Quick Filters OFF that were turned ON before my interaction).