The “iLife Support 8.2” from Apple update seems to affect only /System/Library/PrivateFrameworks/iLifeMediaBrowser.framework. I ran lsbom -a on its package receipt, which is in /Library/Receipts/iLifeMediaBrowser.
I had the update appear on two different computers that didn’t have iLife 08 installed — one of each architecture (PowerPC and i386) — in Software Update. It appeared this week along with Mac OS X 10.5.2 and other updates, but did not require 10.5.2.
Therefore, it seems relatively safe to install (or Radmind to) to more computers than just those with iLife 08 installed. This is important with Radmind because you worry about the layering of updates and dependencies between them, so I’d advise you to do your own testing in your own environment. In particular, I don’t know how it will interact with older versions of iLife if they happened to be in place, so if you have such a situation, you’ll want to do your own testing before rolling into production.