No. Not only no, but HELL no.
The entire point of a system like this is to add accountability and documented flow and history of an issue. There is no legitimate reason I can think of why people (staff) should be able to edit a message after it has been sent to the customer (users). This totally defeats accountability. If staff said something wrong (misleading, inaccurate, angry, etc) they are should and are accountable. I personally will never advocate for a feature like this, and will actively advocate against it.
I suppose ticket system is for help user. Some times some message have some error or too text or just want to add a details on the message without send new one with other new one notification. Webticket can always can be watched online and is not in the interest of the support staff edit in bad ways messages.
Also you can add the right to edit ticket so sistem administrator can decide to not give (in their system ( the right to edit message) but also OsTicket will be able to give this future who are present in most important ticket system. I think is correct user, system admin can choose.
I respect your think but I think this features will complete OsTicket who are incomplete for me now without control of the ticket messages.
Can't think world are all bad. I understand the thinks to not made the staff able to edit a ticket but from side staff you have less control of your webticket.
Also is not true the user will lost everything because email are always sent I hope and email should be have the original ticket message. This is the way I have see work many support ticket system.
Is more complete and complex a system that alow to edit and have this feauture too. Is less complex and dull a system who don't alow the administrator to edit manage his self system.
I'm only user, you are moderator and staff and you decide what to do.
I'm happy to have heard some one else than me who support "my idea" of what is missed in OsTicket. Is for me the first think I see when I tested OsTicket.. The impossibility to manage ticket messages.
Only write, read and have it printed forever, not means if you are operator or administrator, for now in OsTicket you have no power to edit, manage message, put * in customer offensive message or many other think. Edit message can be very more nice as you think. You see only the bad way of this but bad people continue to love and will choose other ticket system if they want use in bad ways the support ticket.