Which incident report page are you referring to? Are you referring to the incident process view page which is displayed when viewing an incident?
To answer your second question, you will have to open the SD.Feeder.TechnicianIncidentForms workflow project and modify the form within. If you're fine with keeping the IM-XXXX scheme and differentiating the tickets via classification or some other method, this could be done via a Process Automation Rule using the OnIncidentReceived ruleset.