Good morning Rhino friends,
Recently I have found that everything I’ve asked for already exists in Rhino, but I will try this anyway:
A command called something like “Selectsimilar” that would find all the instances of a particular object, (curve, surface, polysurface, extrusion, mesh, etc.)
Seldup seems to be limited to similar objects that overlap – but this would find duplicate objects that don’t necessarily overlap.
This, in combination with Replaceobject would be really powerful.