Thank you for your comments.
Store Manager allows to save backup/restore settings (you can select tables, files that should be backup/restored) while setting up backup.
Also, you can save restore from selected files (backup some files and restore only checked files at another store)
Store manager allows to backup / restore all files.
Actually, since each Magento store has its unique hash to generate passwords after restoring backup at another store, passwords would be missed.
The same true for urls, since each of your stores has its own url, urls could not be moved. Also, url rewrites is built depended on store url, so it could not be restored correctly as well.
You can submit feature request at:
if the features that you are offering would be voted, we would check the possibility to implement them.
Let us know if you have any other questions