Hey,
Do you imagine how all that en-gb/en-us stuff appears from international point of view?
Somewhere I saw that Wikipedia should not be stressed as British-English or
American-English only website, if you're really trying to do something useful, at
least for international community, then improve the content, not language pecularities.
If people are willing to spend some time using this
syntax to specify
both spellings, why not let them? It might seem like a little thing to
many if not most people, but it would certainly give Wikipedia's content
a more professional and consistent overall appearance.
Cheers,
Domas