As already someone suggested on the last Shotgun webinar- what if the "Page filter" section, which appears after clicking on the zoom icon, would behave differently. First- when you hoover over the zoom icon there would be popup window from the side with only the selection of filters. Would speed things up. Just go with mouse, click the filter you want and back to work. Just quick switch. The possibility to have the whole filtering area on the left side present would still be accessible as now- by clicking on the icon. Just as it is now.
And second thing- duplicating the filters would help me as well.