Please make the input fields for Service Requests editable, like Incidents. There are many cases where an attachment may need to be added, or a field may need to be changed. This is crucial in using Service Requests versus Incidents.
I ran into this recently as well. I feel that making the "Description" field editable by the user would go a long way to improving Service Requests. Admins put in their description of the service request, but using that as the description in the generated ticket does not make much sense.