allow admin to force check-in for unchecked in files, but retain the original owner and data/time stamp
Currently there is a feature called "Manage files with no checked in version."
The challenge with this is that the admin doesn't have the ability to force the check-in. The admin can take ownership, then check in the file, but this loses the file metadata of the person who originally uploaded the file ("owner") and the date-time stamp that they uploaded/added it.
Usually, when there is a need to look at these files, it is because they are hidden from everyone but the "owner" and the owner didn't realize they needed to check the file in. There is no value in having the administrators name stamped on the file. There may be minor value in having some metadata field (perhaps comments) that indicates the checkin was forced by the admin. But the real value is in knowing who the original author was and when they uploaded the file.
The additional problem with "Manage files with no checked in version" is that if the document library contains more than 5,000 items, you can only use this feature during the large query window (if someone has a way around that, let me know). So being able to allow an admin to do a force check-in would be very useful on large document libraries.