it is not possible to change the username of an existing LMS user (Local Users Setup) through the WEB GUI.
Changeing the name in the cwpass file does work but breaks the relationship to data inside the database where the user is maintained by its old name and not by a name-independent ID. (e.g. cmf DB: CSUserGroupAssociationTable when a private group for the (old) user exists - the effect is that the group is not visible in the GUI anymore- not even by admin)
Is there a CLI tool to change a username consistently in LMS or is there no possibility for such a task?