So, I've made this a proposed feature on meta:
http://meta.wikipedia.org/wiki/Field-value_pairs
I think I got it close to what came up on this list.
There's also an RFE on SourceForge:
http://sourceforge.net/tracker/index.php?func=detail&aid=855890&grou...
Thanks to everyone who refined this fuzzy concept into something implementable.
~ESP