Years ago I had a friend whose employees drove rigs home to 'test' them out before returning them the next day to the customers. One of the guys got into a very serious accident with a customers truck. Of course the truck was not totalled but the other car was, and so was the driver-dead at the scene. Long story short, the insurance company of the truck refused to pay and the shop owner did not have that 'specific' type of insurance to cover the accident. It ended up a totally enormous mess, and the truck was a new truck that had tons and tons of problems afterward. They finally got all the costs covered by both the truck's insurer and the guy who owned the garage's insurer, had a day in court to settle it all.
When I purchased the truck I had before the 06 Dodge, I took it into the mfrs shop for a warranty issue. You really did not even need to drive it because the problem was evident. Well, they decided to do a test drive. The tech pulled out of the dealership burning rubber, plowed through the gears-you could hear them grinding because he was lousy with a clutch. A friend of mine saw him about 4 blocks away flying several miles an hour above the speed limit AND he got a ticket. My friend called me asking me what MY hurry was, and how much the ticket was going to cost me. Three months later I got a visit from the Sheriffs office over the unpaid ticket because the law also holds the owner responsible. I took the Sheriff straight to the garage so he could deal with the idiot who got the ticket. He arrested him for failure to show in court, lots of fines, trip to jail, etc. The dealership had NO idea about any of this stuff and how their employees did joy rides with customers vehicles, or at least that was their statement regarding the incident. I had to file a protest suit against the local law officials because they let the moron bond out of jail without full restitution. The protest suit made him specifically responsible for all the fees and fines of his ticket.
I personally do not want shop personnel driving my truck. I usually take my truck in and wait, all day if necessary. If they want to test drive it before/after a repair, I am more than happy to do the driving and have the tech ride along. More often than not, your familiarity with your vehicle has a lot to do with you hearing/feeling something that's wrong. You are actually the 'better' tester of the final road test over the tech. Many of them do not drive a standard transmission well, you can hear them slipping the clutch as they pull out because they don't know about the wonderful aspects of how our diesels power up on a clutch release. So, no thanks to them taking my truck home for anything. I would not give consent, I don't let them test drive mine, never have sice that incident a few years back. They either play by my rules or I go somewhere else.
CD