Regarding the DNS service offered during installation, could others be added like Gandi.net ? I'm not an expert but they have an api which i hope could be used by Cloudron : http://doc.livedns.gandi.net/
Thanks for showing interest in that backend. There is an issue in our in gitlab for this since some time https://git.cloudron.io/cloudron/box/issues/235
It wasn't asked for often so far, so this does not have a high priority at the moment.