I have Contour 2 and Skip Channel and a Power-On Channel are not options.
"...can I lock the setting so only the favorite channels will work when he uses the channels up and down button..."
I had to experiment with the Channel button on the remote because I never use it. Bad news. If you've set the Program Guide to default Favorites and your Dad uses the Channel button on the remote, Contour 2 will ignore his preference and switch to the next enumerated channel. Meaning, pressing the Channel button ignores any default preference. I suppose Default View is only for the Program Guide and not the remote.
"...too complicated..." With this mishmash of thoughtless options nowadays, I understand switching channels can be frustrating. However, if your Dad can stop using the Channel button, this might help:
After you've set channels and the Program Guide as Favorites, the Arrow Buttons on the remote will stay within the Favorites domain. For example, if your Dad is watching a Favorite channel and wants the switch to another Favorite, Right Arrow will launch a Mini Guide listing all his Favorites. He could then Arrow Up/Down to select and OK to switch.
This is about as simple as I could figure with Contour 2. Switching to Contour 1 may be the best solution.