it would be cool if WE let you edit the master league format, where you pick the number and size of leagues, the promotion / relegations, the cup competitions, and european cup format. but something similar to the real format would be fine too... it would also be good (and probably pretty easy to implement) if you could switch teams after a few years... also maybe you should be able to simulate games.. sometimes its a little boring playing the second leg of a cup tie with your reserve players after you built a big lead in the first leg..
The manager mode in fifa is still kind of half-assed when you compare to similar features in games like Madden and the old MVP baseball... but it still makes more sense than what is in WE. i wonder how the fifa team editing system will work.. if it's anything like madden's it's gonna be real dissapointing.