If you can't type, I'm not sure the mouse is going to get you much ahead either ;-) But it's true that there might be a certain class of users with impediments

If you can't type, I'm not sure the mouse is going to get you much ahead either ;-) But it's true that there might be a certain class of users with impediments for which a different input modality setup could be very beneficial. However, note that standard Emacs already provides menus and mouse support, it's just not what is commonly the focus of the editor.