I would like to be able to edit the "to" field when posting a public reply to a ticket.
I'll describe how it works in the current implementation, and then what I'd like.

Let's imagine that there are three users - the technician, User A (the requester), and User B.
The technician would like to confirm approval with User B, and have the reply automatically logged in the chain for posterity. They don't want this email to be sent to User A, who doesn't need to see it.

So:
- a public reply = email to User A.
- A public reply + a CC = email to User A and User B.
- Internal note = email stays with technician.

I would like the option to change the target of the public reply - ie, edit the "to" field, which is currently unchangeable.

In this way, a public reply would go to User A by default, but this could be changed so that it goes instead to User B, and User A isn't notified at all.

I've seen this in other ticketing systems, so hopefully it wouldn't be too hard to implement.