Just an idea for an enhancement to this plugin - an option to change the "Reset" link (defined in the get_base function on line 87 of core.php), perhaps on a per-widget basis. If I knew how to add this functionality I'd supply a patch, but I don't.
My use-case that prompted this thought: using this plugin's widget to allow a user to filter items on an inventory page, and only displaying the widget on pages containing inventory (i.e. not on the home page). Without changing the reset link, the user would be directed back to the home page, which would be confusing. I was able to simply change line 93 to
return $base_url . '/inventory';, but obviously that's hacky and not an ideal solution.
Allowing the user to set the reset link on a per-widget basis would also allow for using multiple instances of the widget on different pages/kinds of pages. Perhaps just a field in the widget (where taxonomies are selected) allowing the user to append something to the URL would suffice?