Good points, john4, I agree with things like how Riquelme plays and how badly that is represented in PES. Your idea of new stats to cover those characteristics is very good.
About the thing I said concerning the pace of the game, I know that things like what you said happen, but I meant that the players should slow down a bit, at least in some parts of the game (10-20 in-game min), to imitate the flow of a real match. In PES they seem to be always on steroids, even when the game is "slow". AI gets the ball and has two choices: 1) rush forward because it's losing / tying, even if there's still the whole game to be played, and 2) pass it around the back 3 o 4 to waste time because it's winning (and even then this is rarely the case). It'd be great if it'd just chill out and "enjoy" the game a bit, at least in the early minutes.
I'd like some AI teams to play more conservatively, and to let you play more conservatively sometimes. Take Argentina, for example, sometimes their passing around in the back can get boring and prove pointless, particularly in some games where they find it hard to find spaces or in which they have no ideas, Riquelme doesn't shine, etc. If the other team steps on the gas, then they react, or maybe they won't, but generally the other team won't go to great lengths to take the ball from the defenders until later in the game. You don't see the forwards running in a frenzy from one defender to the other ALL the time, like in PES. Pressure is not realistically handled in the game. If the AI decides to do something like that with its forwards, then they should be knocked out by the 50th minute, be them Castolo or Henry.
I know that this also has to do with the short length of a game in PES, but I still think it could be better.