A couple of folks have mentioned it in this thread, but uniform recip tables that are used by submitter X, time and time again can be a reason for declining sites. Dupe content is the enemy of all sites trying to gain SE rankings.
I think you have a good idea there, that will make the job of creating recip tables easier for the submitters, while letting LL owners manage/change their recips pretty easily. And like you say, it'll identify the webmasters/LLs that are still active.
Maybe just put some thought into randomizing it a bit. It it'll keep submitters from using the same recip table of ten bazillion sites, I'm all for it. Hell, I'll put a link to it on my webmaster page.
