The places for airing such concerns are the "ietf-languages@iana.org"
mailing list (responsible for extensions like "gaulish"), the ISO 639/Joint
Advisory Committee <
http://www.loc.gov/standards/iso639-2/iso639jac.html>(responsible for
codes like "roa"), and the ISO TC37
group, currently in the process of adding thousands of new tags . Professional
linguists who are concerned that languages be correctly tagged would be well
advised to get involved with these groups.
In particular, the ietf-languages@iana.org work is done only by email, so
there are no travel costs involved for participation.
Mark