-Ability to change playoff formats,2 team,4,6,8,12,16 heck even FCS style!
-Historical Standings(kinda dumb this wasn't already in)
-Refined player cards (like the new PF game)
-Add/delete teams,conferences (As in ability to have at least 10 more teams)
-Conference movement
-Better almanac with conference champs,conference movement etc

Everything but the historical standings sounds great. The game isn't based off the real teams so unless you just want fake records it's just not doable. Although leaving it in a way to let users create the history would work.