I think this is the easiest solution, in theory. This way even if a "better" pitcher is available, the robot defaults to who is next in the list.

The main impact of the current system is the robot can burn up innings of your best pitcher buy starting them twice in one series even if you have set 5 starters, and can also end up pushing a starter to "rusty" status if they aren't selected when expected, which can be a problem if you are on the road two weeks in a row.