yes ;)
For your example shown above, this will possible in 3 times when Coons surfaces will be created :)

Don't forget that SU is just a "box modeler" pushing to limit to "subdivision" and now "surfacing" by scripters :)

It's a long way to run :)

Size of "triangles" is given by the dividing of the curves (here 12 in the lateral side as it's one standard arc )
And real name of the plug is "Extrude edges by rails" ;)