personally i tend to upload only a few models at a time, did rather a lot during the contest time.
I don't think there is a option, might be nice to add that
"don't send notifications to followers about this model" as example.
Keeping them private will stop anyone from seeing them unless they have the link. Not quite sure if it gives a notification if you upload it private and then set to public.
The copy function would be nice though, especially if you want to have 2 versions. Like a daytime and night time setup.