I think osTicket is a great software and me and my team use it everyday. But there are some limitations: I would like more options when sending a response from osTicket. The way this is done today is extremely restrictive and sometimes hinder us in our work. I want to suggest the following options for each email that you send:
Sorry for my bad design skills!

With these options you could select any one or many of the peaople you have communicated with in this ticket. You could even send to a new collaborator. You can also choose exactly which you want as To:, Cc or Bcc: