It would be useful to be able to combine old Finale score and parts into a single Finale file with linked parts and keep the formatting of the score and especially the parts. ScoreMerger makes a score out of existing parts but it doesn't keep the formatting of the parts.
Most likely this would be most useful for long-time Finale users who have a plenty of extracted parts and need to revise them.
I posted about this on the MakeMusic Forum on Nov 28, 2015 (the link will open the original thread).
Using Finale 2014.5 on both Win 10 and Mac OS X 10.11.6.