I see later on that this is only accessible to sysadmins, but I still don't think it's a good idea. This value is a critical identifier. Having an editing control for it is like having an editing control for a record's primary key.

If it needs to be changed, it will need careful thought and review, and a formal record that the change was made and why. So changes to it should be made via scripts that are associated with tickets that describe the nature of the data issue that caused it to fall out of alignment. Having a UI control for it encourages random poking instead of care.