Allow top button and Mouse BTN 4/5 to be used in conjuctnion with each other. i.e. Top mouse button is a modifier and MB4/5 are MB4/5. That way I can press top mouse button(as ctrl+shift) and mb4/5 and have ctrl+shift+alt with mb4/5. Currently, it does not work this way. I could also do top button+side scroll wheel. Need this feature badly!!!