I do whatever works for the particular staff to jam more innings onto the best pitchers, inning-for-inning. If the SP are noticeably worse, inning for inning, than the top 3-4 relievers, I give the starters a quicker hook. If the reverse is true I might lengthen the pitch counts for the SP. If I have a single stud reliever I might quick-hook some of the other RP, and set the auto-rest for the stud lower than the usual 98 or so. And in an elimination game I may rest everybody except the specific guys I want to pitch in that game.