proposal: copybytea command for psql

A while ago I went looking for nice ways to export an unencoded bytea 
value using psql, see 
<http://people.planetpostgresql.org/andrew/index.php?/archives/196-Clever-trick-challenge.html>. 
Regina Obe is also in want of a solution for this: 
<http://www.postgresonline.com/journal/archives/243-PSQL-needs-a-better-way-of-outputting-bytea-to-binary-files.html>.

It seems like what we need is a psql command for it, something like:
   \copybytea (select query_returning_one_bytea) to /path/to/file


Does anyone have a better solution or any objection to this feature?

cheers

andrew