Hey, why do not EA Sports include ALL European leagues? And some from South America, USA, Asia and Africa? Of course that is alot, but many management games did that.
For example Premier Manager 99 of Actua Sports

I think that's a good idea. But the game would be VEEERY big. But they could manage this allowing us in the installation to choose the league we wanto to install. wouldn't it be cool?

Well, Premier Manager i a big game too.
Although it is one of the best managment games ever, it is so big, that gamesaves weight about 8-10 megabytes.