thanks for the feedback !
Indeed it’s not really supported for now to simply add another domain … I guess I could manage to have a standalone script that would install a single domain, which could be run if you add a domain.
On the other hand, this app is supposed to be a sort of temporary solution while Let’s Encrypt support is being implemented in Yunohost itself :). Then someone could use something like
yunohost domain certificate fetch yourDomain.tld
(or equivalent feature from the web interface)
I’ve been meaning to start putting my hands in a proper integration but I’ve been busy with other stuff so far …