I reckon that EA should include injuries more often, including misselaneous injuries (like the flue, or gettin injured in training sessions) at crucial times (in the playoffs or before an important game).
Also, they should include some sort of option where you set training programs for your players so that they can improve on things they work on but can get worse on things they don't work on.
As well, they could include a trash talk button and have a temper rating in the player ratings and if your player is talked up enough, he can chuck a sike! (Include suspentions... die Ron Ron!)
Better commentary would be cool and include an offseason and also a Rookie-sophomore game!