I have found something else here, maybe that'll do it.
http://wowui.worldofwar.net/?p=mod&m=3053
It hasn't been updated since last patch, but it does have a note saying it works with WotLK, so I'm not sure of it'll work or not, but that can pretty much store information about players, and allows you to set if you like them, dislike them, or if they're neutral to you.
I think this is what you need :P