I know this is low on our priorities.
Some time ago, someone suggested a better way of doing interlang links.
The problem is that as more pages are added into a "set", the work
involed to add yet another one increases. By the time you have about 6
languages, there's a high risk of bad linking, and they end up as a
chain rather than a net of links.
I have an intermediate solution which I think would be simple to implement:
: ignore the link made to the *current* language.
ie, on the English wikipedia, ignore an [[en:foo]] link
this would mean the the SAME block of links can be pasted between all
the involved pages. It's not perfect, but it would speed things up for
the time being :-)
See
http://www.wikipedia.org/wiki/Czechoslovakia for what I mean.