I didn't take the time to read through all the 32 pages, so many (maybe even all) of these have probably already said.
1) Like Cookie Boy said in the previous post, it would be important for us to save our own pre-set player instructions. Now when you sub Beckham type of player to Robinho who is more of a dribbler, you have to change so many sliders every time. By letting us save our own pre-sets (and "unlimited" number of those!) all this would be eliminated.
2) More options in to tactics screen. For example you could instruct your wingbacks not overlap, to overlap all the time or overlap some times. (Just like with TTB.)
3) Instructing your strikers to
a) come down to meet the ball
b) go forward and try to find space behind the opposition defenders.
This could be done with a tick-box.
4) Instruct your (wide)players to cut in / stay near the sideline / mixed. This way you could instruct your wingers to go to the box while your fullbacks would provide width. This can be done to some extent now, but it is a hazzle and not clear for many players how to do that.
5) Players would learn PPMs while playing. For example if you have MC in your team and you set him to shoot from distance and he plays in your team for example 3-4 years, I would guess that the player would naturally try more long shots even if the would swap teams. This could also mean that by setting your MR to cut-in regurarily, with time he would adopt the Cuts inside - PPM. Of course this would depend on players potential and the fact that does he like you or not.
6) Shooting charts. Plain and simple, add a view to match stats where you can see where your team has shoot and where the ball has went. Simply an 2D pitch with red X (and the number of the player who shot) marks shot wide/over the goal and green O marks a shot that resulted to a goal. This way you could analyze that you concede a lot of goals from outside of the box and you have to do something about the issue. Even better if you could see "still image" or a screenie type of picture of the situation so you would see where your players were on the current moment. (By hovering your mouse over the X's and O's the image would change.)
7) Passing charts. By selecting a player you could see where he has tried to pass and with what success. This would help you to analyze for example your playmaking.
8) Training revamp. Divide the training to more spesific sections like passing, shooting, one-on-one situations, set-pieces, off the ball movement, defensive movement and so on. Of cource training eg one-on-one situations would improve the dribbling skills and technique and a little bit of first touch too while defensive movement would improve the tactical discipline and positioning of players and so on. Of course this would mean the tactics section would be more complex than it is now, but hardcore fans would appreciate an approach of this kind. The newbies could just use the default settings for different positions.
9) Improved mentoring: players would not always "copy" the mentors PPMs because really, isn't that a little bit stupid? If Guti argues with the referee, would the player being tutored really start bashing them too? In some cases of course, but every time? I don't think so. Also while selecting a tutor for a player it would be good if you could see the personalities of players available in the drop-down menu because currently you either have to remember who would be suitable or always check it and then make a decision.
10) Improved player interaction: you could point to player what he has done right and where he needs to improve. For example you could say to Gilardino that you are pleased with his efforts but you hope that he would be more consistant and improve his teamplay.
11) More options in team talks. Maybe it's not necessary to add the options, but increase the AVAILABLE options. For example if you are winning by 2 goals you could still encourage players, now you just have to settle for being pleased.
12) Talks to sub players: when taking a substitution you could say something to the player coming on, eg no pressure, I expect you to deliver etc.
I do realise that many of these would make the game more complex (of course it would be great to be able to delegate some of the things to assman), but I think that SI has to decide whether they are the egg or the chicken. They can't fully please the casual player and the hardcore fans with the same product, because for one of those groups the game is too simple/complex. If SI tries to be in the middle, then both groups are unhappy.