Hi Mike - that Rhino command you're showing there is Rhino's NetworkSrf command. The equivalent thing in MoI of making a surface from 4 boundary edges is MoI's Network command. Blend is a little different since Blend focuses on building a connection between 2 sides.

But really the main goal for that kind of continuity stuff is to have a separate command like Rhino's MatchSrf that will allow you to tweak a surface to make it smooth to other adjacent surfaces. That's more flexible than only something built into Network since you can use it in many other situations as well. Then later on after that I'd figure out if it's necessary to integrate it into other commands as a kind of bundled operation, but maybe not - it can kind of increase command complexity when trying to kind of bundle things that you could already do with existing commands kind of baked in like that.

- Michael