The idea is that I'd like to assign a back keybind to one of the side buttons on my mouse so that I don't have to go clicking on the "Done" button ever again since it's one of the most common interactions you do in BQ.

JEI does this for browsing recipes. Its default is Backspace (which is ergonomically absurd), but I can customize that in the settings to the back button on my mouse. Presumably, I can set multiple controls to that button from various different mods, and it wouldn't matter if there was a conflict because only one mod's GUI is active at a time.

Sorry if this has been asked before, but I searched and didn't find anything with the words "back" or "previous" in any titles for open or closed issues.