instancer

Script makes instances of picked main object from all selected objects.
Target objects can be replaced (deleted, primary script function) or leave untouched.
New objects can copy scale or rotation from their previous versions.

Exaples:
Have some copies of some object (not instances) and want them change all same way.
- Convert them to instances, change them at once by editing just one.

Want to make instances of main object at every object's position from selection

Want to change many same parts (sub-objects) of one object already collapsed to editable poly
- Detach them, convert to instances, edit one, collapse

For instance you can convert back to insances windows on building, pillars, tress in the forest, car wheels... everything that was copied or collapsed.