I'd like to propose adding the chamfer option to skethcing. I see that we have the ability to add fillets, so I started looking for a way to chamfer a sketch, and found nothing.
This has multiple uses, other than small little corner edge breaks. If you need to draw a corner that has a large angle on it, this tool would be able to do that. Chamfers are not always small edge breaks....
If the concern is "adding one more button" perhaps make a modifier, so if ALT (or some other key) is pressed, pressing Fillet will allow it to chamfer.
Chamfer should have the option of specifying angle as well as length of angle, length of hypotenuse, etc