You can already do this, in Emacs and possibly other terminals. It is pretty easy to implement. The problem is that this can also cause other problems, especi

You can already do this, in Emacs and possibly other terminals. It is pretty easy to implement. The problem is that this can also cause other problems, especially for newbies, because editing the text may not do what you think it will do (e.g., editing the output of ls or editing a command after you started running it).