It would be really helpful when you are updating linked files like PDFs that you could select all of them and be able to change the source path all at once. If that is not possible, it could be a dialog box like when updating xref's in cad where it asks you if you would like to update the same path for other files in the same root folder. Some of our consultants don't use Revit so we link their PDF's into our file so we can print all at once. When they update their plans we have to go back through one by one. Revit is slow processing this and it is very tedious.