With the non-translatebles used being removed from the F4 list, I believe it would be reasonable to restore duplicates on the list.
If a non-translatable occurs in a current segment more than once you can't make use of the F4 list which is empty and have to copy the non-translatable otherwise.
I don't think it facilitates the workflow.
Okay, let's see how it pans out in the latest build. It might return to the previous implementations if it has some undesireable side effects.