It may create some backward compatibility issue.
But I think very few applications are using more than one connection at all
and if they do they usually added a connection and didn't change the ID1 pointing to the J! DB.
Setting connection ID1 to be always the J! DB (i.e. fetching the DB-params from Config, not from the Fabrik table) would stop this "keep in mind to open and resave the connection after installing a backup" etc.
But I think very few applications are using more than one connection at all
and if they do they usually added a connection and didn't change the ID1 pointing to the J! DB.
Setting connection ID1 to be always the J! DB (i.e. fetching the DB-params from Config, not from the Fabrik table) would stop this "keep in mind to open and resave the connection after installing a backup" etc.