I like your changes!
I want to add it officially to the WB. It looks like the round relief option works good and also backward compatible, so this is very good.
But I have some issues with the edit window.
1. If there are more then one face bended, I can see only one in the list. Pressing the add, actualy replace the current face, not adding. Is it intended?
2. Pressing Add without selecting anything generates an error.
3. a bit related to 1: selecting more then one face and pressing add, again shows only one face, even though actually when pressing OK, both faces will be bended.
4. If you find a way to make it work on "Part Design" as well, this will be great. If not, maybe just show a message that it works only on "Part".