Split buttons (please!)

This is a tiny UI thing, but it’s be really nice to change some of the menu buttons - where they can reveal a dropdown - became split buttons. Press & hold over un-split buttons is fractionally more error prone (from a UX point of view) since the introduction of pressure sensitive trackpads (Force Touch).

In the case of the attached image, the right hand arrow portion of the button would immediately reveal the drop-down options, while the left hand side would trigger the dialogue.

Screen Shot 2015-11-03 at 23.18.44.png