[AUCTeX] wrapping text in verbatim environments

[thomas]

Hello all,
I would like to wrap the text in verbatim environments (to - say - 70
characters), just like in mail-mode. I don't want the whole document
to be wrapped, but just the portion of verbatim text I am editing. If
it is not possible to have an automatic wrapping (auto-fill-mode (?)),
at least, a manual wrapping with M-q.
Thanks for your help
++ Thomas