1Password does have a Generated Passwords vault which will store all of your passwords generated with the Strong Password Generator. If you name sensibly them when generating, you will have a handy reference list that you can transfer to the Accounts vault at your leisure.
Perhaps I'm missing something, but I see no way to transfer (convert?) an entry from Generated Password to Accounts. I had to copy the password and create the Account separately.
Can I report what I think is a bug here? When EDITing a Generated password, the password is revealed. This not the case when EDITing other types of 1P data. Unless it is intended just as a backup in case I don't remember to save a proper login or Account, but then why is there a Notes field?