I added the multiple Daemon ID improvement to CORE-1329. I'd like to discuss the multiple IP address / port provisioning recommendations with Tyson before I create a task on that. If anyone has anything to add, please chime in.
As for the Multicraft account (And FTP), the account is created when the first server is provisioned for the account, and this email should contain the login details for Multicraft. Subsequent servers are added to the same account, and the Multicraft login details are unknown by the service so they are not included.
This can be handled in the welcome email by using a conditional statement or a note to say that it's the same login as the previous servers.
We are working on a feature where modules may share information between services, and I hope to have this in 3.3. This would allow a 2nd, 3rd, etc server to include the same login details as the first.