- Annoyance
It is not possible to add a user with the username "mail". (Presumably this is because there is already a system-created account with this name in /etc/passwd).
However, when clicking "Add", the unRAID logo animates as normal, then appears to complete with no error message. It's only after clicking "Done" that you realise the user was not created. This means going back and creating the user with a different name, but having to retype password and description, and re-upload the image.
Is it possible to have unRAID display a message when the username already exists? Ideally, it would show on blur of the username field, but on clicking "Add" would probably do, as long as the field values are preserved.