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By gimmick, I mean it's of marginal practical use.
If you think it's not a gimmick, what use would you put it to?
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For one thing, I wouldn't use "live PR" as a bargaining chip for linktrades
But even if there were no practical uses, as I said it's one piece of the Google puzzle, however small that piece might be, and food for thought when I have a few minutes to kill.
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I don't know what "live pr" tool you are using, but tools like that attempt to use a mathematical formula that checks the pr of the pages linking to the page you are testing, does a few calculations, and show you an approximation of what the pr of the page would be if google were to update pr that day.
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To go back to your previous post, this particular script (and a few others I've seen) doesn't do any adding from what I understand. It sends a query to Google, then Google answers back with an XML file. The PR displayed on a page as *Live PR* is a number taken from that XML file.
Future PR probably does involve some math, but I have no clue how that works.