When researching different content opportunities, I often try several different keywords before I land on something good.
It's 99% the case that I want the filters to remain when I change the keyword, but currently the filters get reset every new keyword search.
E.g. When searching for content with no RD but high traffic, you are often left with search results that contain no sites, so you need to change the keyword. But, when you change the keyword, the RD and traffic filters get reset.
I'm proposing that you have a simple "clear filters" option, since that's what a lot of other tools do. Google Keyword Planner, for example, does this.