There already is a way, although it’s a hidden device and a little bit buggy as of 2.7.2 (although at least one bug has apparently been fixed for next release.)
f+d+K: That’s basically what I’ve been trying to say my assumption is too. Although if you have Snap=Grid then you have to zoom right in to be able to set the two points next to each other, if the GUI would let you put the points on the same position, even though it would still behave like this, it would be easier to enter these immediate changes into the Automation Editor.