Allow Custom Display Names for Subusers

It would be great if subusers could set a custom display name instead of always showing their default username/email.

I often use my subuser account to manage and set up servers for my clients. Since some of my clients also host on UltraServers, our activity can sometimes appear together, which makes it difficult to tell which activity belongs to me and which belongs to the server owner.

Having a custom display name, such as CustomName, would make it much easier to identify who performed an action. The actual username/email could still remain unchanged for account identification and security purposes.