Here's a feature that would be cool to have for low poly modeling, and would make this the ultimate one-click chamfer tool.
I would love it if I could have this modifier chamfer and edit vertex normals automatically.
This can help immensly for normal mapping as well as making interesting curvature/chamfers without spending a boat-load of polies:
On the left we have the edited vertex normals smoothing out JUST the corners of the box.
It looks awesome and uses only one iteration of polies
on the right we have the default max chamfer workflow. Its starting to reflect closer to the way I want, but it's not really accurate/blobby.
So the original face's vertexes would keep their normals after the chamfer, or it could be like a slider where you could dial in how much of the original vertex normal direction you want versus how much of the averaged direction you want.