Currently, the mouse side buttons (Mouse4/Mouse5) are hardcoded to navigating the "recent files", with no option to use them for anything else (the shortcuts menu does not recognize them at all when pressed).
It would be convenient if those buttons could be rebound and used for other functionality. Specifically, I would like to use them to navigate to the previous/next image in a folder, since I use that much more often than the recent files list.