A few things id like to see;
1. Fixed shooting - The shooting in the match engine annoys the **** out of me. I know it's trying to say that you are missing the target, but why do half my one on one chances go right past the post. In real life, normally the keeper saves them or they are put in the net. When a player is one on one, id like to see him open up his body and slot the ball past the keeper.
2. Media/Press Conferences - Give us more options. Give us the choice of Assertively, Calm, Passionate etc... and then the options. Make the coming game reflect on that conference. Say iv'e had a go at the manager, there could be an instance where the commentary below says 'Oh my, the two managers have come face to face on the sideline!' Then, the referee could walk over and send one or both to the stands. Same with crowds. If you mention that this one is crucial for the fans, then if you score or win, the fans reaction will be much bigger than normal, and even bigger than a normal rivalry reaction. This would work well.
3. Australian Transfers - Im not sure if this is a rule in any of the other leagues, but apparently i can't buy a player from another Australian club until my third season. In real life, here in Australia, our clubs always buy players from other clubs. Please fix this SI, it's annoying since we only have a maximum limit of 5 Foreign players, so we cant really buy any good Australian league based players in our first two seasons.
4. Schedule Events/stadium vendors/upgrades - Iv'e been playing alot of MLB '12 the Show lately, and it's come to my attention, that it shows more attention to detail in the finance department than FM does, which you may think is strange. In MLB '12 The Show, you are allowed to purchase food stands for your stadium, drinks, merchandise.. and not only can you choose those things, you can choose the prices of items inside the vendors. Say its merchandise, you can choose the price of Shirts, Bats, Bobbleheads etc... Also, you can set up a playground out the front of the stadium, this all to gain profit. This i would love to see in FM13.
5. Promotions - Again, in MLB you can schedule matchday promotions. SI, you should give us the option on the calendar screen, to select a date, choose a promotion (Trivia Night, Soccerball Special, Awards night, Jersey giveaway etc) Let us choose the date. Say i want a Soccerball special. I should be able to choose the quantity of soccerballs given out at the front of the stadium for a certain day, thus attracting bigger crowds for future games. Whilst im at it, LET US CHANGE ACTUAL TICKET PRICES! - Yes, id like to see ticket prices being altered and Season Ticket prices.
6. Transportation - Finally, another reference to MLB, you can select your way of travel from city to city. You may choose between Plane and Bus. Obviously the plane costs more, but will get you to your destination quicker.
For those last few references to MLB, on FM, we all know that we ARE NOT the chairman, so we cant actually make the changes, but what we could do, is make the changes, but have the board accept the idea and place the promotion for that date. I think this would be a cool feature, adding to the realism.