I often see methods "Quickest" and "Shortest," and both can sometimes take some really crazy paths. However, when I'm pulling a 12klb fifth wheel camper, I would much rather "reduce the number of turns." This could be accomplished through a new routing preference called "Simplest" or "Fewest Turns."
Other rules would still apply regarding other preferences, but when given the choice between multiple routes, the simplest one is often preferable.
For example-- when you're giving your friends from out of town directions to the best steakhouse in town, you don't tell them to cut through a neighborhood or find their way to the nearest interstate -- you tell them the SIMPLEST route from your location. So should CoPilot! :)