A workaround is to assign Alt+S to another command

that overrides the Ribbon shortcut. You can assign it to a command you may or may not even want to use, but this still may not work in Bayscribe. The built-in Alt+S is assigned to the Ribbon and those shortcuts cannot be changed or deleted. When you go to the Customize/Keyboard dialog box, it says Alt+S is not assigned, yet it is on the Ribbon.