This sort of proposal seems very interesting, and I definitely would like to see it get more attention. I just briefly looked over your post, so I can’t tell if it has been done before or been rejected. I have been watching the discussion going on in Change Drag and Drop default setting, and so far it has been people arguing about what is “sane”.
I think this idea is a much better step towards what I think the real goal behind @LSLSLS’s thread was: accommodating the new, typically uninformed user.