It would seem to me that in this day and age, that an option to have the command line popup at the cursor (a little bit like MacRhino) would be appropriate… I would simply suggest a minimalist approach more like AutoCAD’s small text box implementation of this feature rather than MacRhino’s huge dialog box. Currently with Rhino tooltips all one can do is have a suggestion, but it isn’t an active prompt.
Just an idea…
–Mitch