Well, besides keeping track of IRS% for relievers.
1. Keep a running tally of daily "Performance of the Day" appearances, 3 points awarded for a first place finish, 2 for second, 1 point awarded for 3rd.
2. Running tally of most and least cost effective players. This is listed in the FRONT OFFICE tab but it only lists on that team, and only the top and bottom 5. Make it a stat that is tracked.
3. Total money earned over course of the player's career. Yes, it's in the history but, again, make it a stat that's kept track of.
Nothing earth shattering - just mostly logical expansions on stuff that OOTP already does.