Tabs to Spaces and Spaces to Tabs are without keyboard shortcuts. Allan Odgaard said he would consider giving them shortcuts if he knew what shortcuts to use. [1]
I'm thinking Command+Option+Shift+S for Tabs to Spaces and Command +Option+Shift+T for Spaces to Tabs. These seem to be available (but I have no idea how to be sure).
Does anyone have a better suggestion?
Trevor