Welcome to the QAP forum, megavlad. Thanks for your good words.
> I setup a shortcut with 'Special Mouse 1' to open QAP. Is it possible to setup QAP so that, once it is open, that pressing 'Special Mouse 1' again closes QAP?
> That is, use 'Special Mouse 1' as a QAP toggle, instead of just QAP open.
No this is not possible. Usually, you can close the menu by clicking anywhere outside of the QAP menu aor by hitting the Esc key. In some case, if this does not work, you have to click the "Close Menu" item at the bottom of the menu. About this:
https://www.quickaccesspopup.com/what-is...enu-issue/