I would make them go over a day on the lake with you. have them set the boat for all the things you do.
If you surf then have them set the boat for surf so you know exactly what you need when you don't have the dealer with you. Have him go over every option of what you plan on doing on the water.
Since he is there I would make him go over all the switches and walk you around the boat so you know that everything is working correctly. I would even arrive before and after the boat launch so he can show you the correct way to load and unload the boat. The little things will make your days on the water less of a headache.
If you have never driven an inboard have them show you how the boat pulls when in reverse. Might be familiar with that from previous driving but if not have him go over it with all that will be driving the boat.
Don't be afraid to ask him anything that comes to mind. He would probably spend the day on the lake with you than be back in the shop anyway..