In a related subject (my final on the 'face' command) it's annoying when your faces come out twisted!
With an edge pre-selected, there's 50% chance I'll guess the vertex order wrong, ending up with a twisted and wrong face... Perhaps I'm doing something wrong?
I'd like to suggest that the default is to reorder the vertices so as to define a 3D face that that projects to a quadrilateral. That's because we design usually with a view that's more or less orthogonal to the face we're creating. I don't want to be constrainted to thinking about my vertex order!
Of course, an option must be provided to obtain the current behavior, in some 3D cases you'd want to construct a twisted quad.
