The thing is that there are so many things unclear to us. The statistics freaks want to calculate, analyse and evaluate. That is what we love. For example:
1) Does right or left foot matter?
2) Does hight for a goalie matter?
3) How much does a special ability influence a player? It would help enormously that something says with corner kick your player has 50% higher chance to get a succesfull corner kick.
4) Do players have hidden statistics? Some score enormously better then others. Why? Can we deduct this from anything?
5) How much does a higher percentage for certain skills? For example does passing help with corner kick? Does shooting help with free kicks? If so, how much?

What I would also like to see is for example. If you click on a player during a match you get a more specified list of statistics. Stuff like:
Percentage of passing completed
Percentage of passing to the right
Percentage of passing to the left
Percentage of shooting
Percentage shooting with left
Percentage shooting with right
Km's run per game
Stamina at the end of the game
Number of tackles performed well
Number of fouls committed (these last 2 can show you wether a player is too agressive or not)

Maybe even put up a number of possibilities per player if wanted. I can imagine that you want to set your 2 outside defenders on agressive tackling against good wingers to keep them short.

Possibilities are limitless.