The last step of manually merging a smartmatch is to decide if a citation should be added. I always want to add a citation if new information was merged, but the citation should be attached to each updated fact or name. The only time that a MyHeritage family tree citation should be added at the Person level is when a new person is added and all the information came from this one source. From a genealogy research standpoint, it is very important to track sources at the fact level because each fact could have come from a different source, with a different level of confidence.
An even better option would be to allow me (the user) to choose during the merge process whether to add a citation to each changed fact, or to add a general citation. Same is true with notes for an individual fact versus a general Person level note.
Also, when the merge process adds a new citation source, it should assure that "MyHeritage.com" is cited as the Repository.