I'd really love, if the fan-scene was improved. All the spectators should not act the same way, the fan groups should bring flags, banners, more pyrotechnics and so on. Maybe also make some great tifos before matches. At the same time it would be nice to see the teams walk onto the pitch with cheering fans.
And where are the managers? Me and my colleague should be standing by the sideline and cheer up our teams.
The last thing I'd like to see, is a change on the pre-match screen before starting a match. It would be great to be able to add pictures of stadiums so you can see what the stadium you're going to play on looks like.