Not on seniority list and under separate employment with the company.
As far as I'm concerned, these should be seniority list jobs and if not I know ~1400 UA pilots who could easily ferry aircraft to/from MX and the paint shops.
Engineering test pilots do a lot more than ferry airplanes. I know a guy who left the line to go do it and he was a TPS graduate. He told me that was a requirement.
I don't know that for sure but I know these guys do a lot of the rigging flights and stall series and other stuff required after heavy maintenance and certain other events.