Improve Jira's Quick Filters with optional radio vs checkbox functionality
Quick Filters are implemented as a checkbox functionality (i.e. clicking each filter is an essentially adds an AND operator). I find I rarely need to use Quick Filters in this way—although I could see its usefulness.
My suggestion is to have the ability to toggle the functionality of Quick Filters with a modifier key (for example) that would switch from the default checkbox to and radio control instead.
Think of a old timey car radio with push buttons.