Toggle Wireframe Keyboard Shortcut
First off, thanks for implementing wireframe mode while painting.
I use maximized viewport mode for painting. Sometimes I'd like to follow the topology better with my brush, so I use wireframe overlay.
It would give me better workflow if the overlay could be toggled with a keyboard shortcut, instead of exiting the maximized mode, wait for the menus to redraw, navigate to Viewer Settings, scroll down and toggle wireframe, then going back to maximized mode.