We've got a fairly robust Mail Merge script with attachments (either the same for all or per-user), but distribution and maintenance is tricky given the lack of

We've got a fairly robust Mail Merge script with attachments (either the same for all or per-user), but distribution and maintenance is tricky given the lack of support for a centralised library of code. Ideal would be allowing any publicly accesible URL (with some security measure to avoid blatant security holes) like Github raw master (always up-to-date). The closest I've found is using eval (which is clearly NOT the best approach). There would need to be a format to specify which services you want to use (as currently it derives these from the source you write in the editor). I would LOVE to be able to load in 'authorised' libraries to avoid redundant code.