Yes - I think this is useful enough to be available under Maemo by default. Regrettably I don't know how to do that, my experiences with the Maemo development environment aren't worth talking about, but if someone with the skills and the tools wants to package it for Maemo, that would strike me as worthwhile. It would be useful to have the relevant man pages along with it, and probably to undo Debian's "all users disallowed by default" policy, as well.

Then all we'd need is newest curl/libcurl in CSSU and we'd have an easy route to IMAP APPEND...