The thread on batting orders has arisen just as I was considering a similar question.
What HAL knows and employs in choosing who to play is a matter of significant debate. For everyone who says HAL knows squat, I've seen someone else drop a Schmidt, Boggs or Brett when not used by HAL and later proven correct (worst year) when someone else picked them up. I have my own theory of what he does, but that is not the point of this post.
My feeling is HAL should be transparently dumb. Whether HAL knows something or not, there should be no advantage to be had by not choosing a lineup. Presented with a blank lineup, HAL should make a lineup using the most expensive players possible. Ignore anything he knows about which year a player is, or what tilt versus the opposing pitcher and ignore defense. Relievers should be used by value first then by rest then alphabetically if need be. Starters are already salary driven. Make it consistent and then everybody will have to use their own sleuthing skills to figure out who you have.