i might confuse that with scratchbox, but doesn't MADDE too download tarballs and extracts them into the chroots?
thus: what about a script that allows downloading devel packages and libs, converts them to tarballs (either with alien or with ar, since debian packages are nothing but ar archives containing data.tar.gz which is the actual archive we need here) and extracts them into the matching folders? as long as the folders follow the structure maemo uses simply extracting them below a certain folder should be sufficient.
not sure how important those packages are and if they would be available to MADDE (is MADDE a nokia project after all?). still confirms my opinion nokia doesn't like development for maemo.