LOL, I just ran a project replace on about 2000 documents.
Worked great, did what it ought to. However while it was working the PR window was dynamically resizing itself depending on the length of the title of each individual document. Which meant that for the minute or two that it was running it was looking absolutely crazy jumping back and forth between various widths.
It wouldn’t be a terrible idea to have it be a constant width on the screen while working.