How would that work? miners need to signup to the new pool to be able to move? We can not auto create accounts for people. Most of the info we have for them is encrypted. And even if we could, the person moving is the one who has the option to create his account or not, we have no such right.
I was unaware of the trouble involved of porting over user data. I simply figured you could provide invites to select miners on Nitro1 (to circumvent the closed public registrations), have them move over, and then allow public registration.
The accounts data can be moved even if it is encrypted, just need to keep the same salts in config files, and people can log in using their old account data if you want.