Feature proposal for psql

Hello
I have a working proposal for a small feature, which I would describe in
one sentence as
"named parametrized queries".
Basically it allows to save something like this in a file:

--psql:MyQuery1
SELECT 42 FROM @0
WHERE true
--psql:end

--psql:MyQuery2
/* updates stuff... */
UPDATE stuff SET ..
--psql:end

Then, from inside psql, I can invoke the query by its name, and pass an (or
many) argument(s).
For example, invoking it like so:
db=# \nq MyQuery1 blabla
Would substitute literally the "@0" with "blabla" and send it to the
backend.

I am aware that saving queries is already possible with variables (:var),
and saved variables can be sourced from .psqlrc file.
However, I think passing arguments in bash style is kinda nicer, because I
don't need to set any variables beforehand. Also this would allow to have a
clean and valid SQL (well kinda, if no placeholders "@" is used) and
comments.
I have also added autocompletion.

Should I send the diff to the mailing list, or maybe it's not something
useful?

Regards
Denis