Love the readability and content of the license terms as well. In particular the parts on software modifications.
One feature that is a show-stopper for our workflow is the possibility of shared drafts, i.e. where an email response can be prepared and stored by one person and later reviewed, perhaps completed, and sent by someone else. Do you think this is something that you might consider adding in the foreseeable future?
edit: btw, might serve as a differentiation over Zammad https://github.com/zammad/zammad/issues/629