yup, looks like I'll have to implement it myself :P
After a bit of investigation I think it's not so easy.
-v switch is reserved in psql for "set variable".
So the patch would have to inctroduce a new switch or use VERBOSITY environment variable, which actually means something different.
There is another way - much simpler I think:
psql -c '\l+'
--
Filip Rembiałkowski