press s twice to constrain vertices to edges whilst scaling
sometimes you need to scale vertices away from each other, but keep them constrained to the edges they're on. Can't find a way to do this currently.
So I propose you press the s key twice to constrain verts to edges, much like when you press g twice for moving verts
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Duplicate suggestion!
Edge constraint for Scale (multiply vertex slide)
* @ammusionist * thanks!
I would also say rotation! In 3DS Max you can edge constraint then rotate an edge loop on a cylinder for example, to Shear it, and not crush the geo/do something weird. I really miss this when in Blender. If you have a rotated cylinder with edge loop cut down the center and want to rotate that edge to create a 45 cut, it's not really possible, unless you use Knife Tool or some other manual way. That I know of...