I've agreed w/ the advantages mentioned.
aka Encapsulation, porting.
But for now, I've decided to make them all global, as I can export the tags via unity to a .txt file. rename the file to a .csv, open in excel, manipulate the info easily, paste into notepad+, yada yada yada, all tags are now in the project.
Only took me 3 hours. Much less if I didn't keep stopping to read help files.
Hopefully I can do the same w/ the FB instances on Monday.