It's possible for Operators to edit the header fields at any time. Therefore, it's also possible to give the Customer the ability to edit a rating field within that group of fields. It's also possible to put this anywhere on the page.
Sparky - I've been busy and just saw your response. This sounds promising. Can you give me an idea how to go about this or point me in the right direction?
TTX is a huge program yet it's very well organized into various well written modules.
My suggestion is to go through the index of Modifications published in this forum's sticky thread.
Learn by doing. Go through each one at your own pace. It will teach you how TTX works. It will teach you where everything is located. And it will teach you how to tweak them for your own purposes.
TTXTickEd.pm is the module for editing the Ticket Header fields.