How do I add "Delete and fill selection" to an action

I've been using the Delete and fill selection.  It works pretty well most of the time.  BUT, there are times when it works better if I do the selection then do a Select>modify>Expand>and add a few pixels.  Then do a Select>Modify>and feather about half the size of the added pixels.

I'd like to put this in an action, but I can't figure out how to put the "Delete and fill selection" INTO the action.  I can use the shortcut Shift+backspace, and it appears to work, but HOW do I put this in an action?