Hello.
I'm very happy about that you work on retopo room.
I tried old versions of 3Dcoat and maybe some of these features were developed. First thing that I was missing was a snappin to the points. This is important for making low poly from hard-surface objects and CAD. I really need tools that are close to modeling to do that. Second thing that was not ok for me was pure manual retopo. Each polygon should be drawn by hand.
You are doing a great work! Thank you a lot!