So I just wanted to add myself to CC on a ticket created by one of my colleagues.
So I use the "Additional CCs" functionality and hit "submit". (first screenshot)
This unfortunately creates a new "post" as my user (second screenshot) and the system sends an email to the current participants, which will confuse them why there is now a new message from me without any text involved.
Some small "watch/subscribe ticket" button would be cool.