I have to say I too am a little disappointed by the lack of new additions. My major worry is that SI are getting too caught up with extreme realism and forgetting about the fun factor. It's not SI's fault that there are now transfer windows in the real world but without the ability to buy players throughout the season there needs to be something to stop the game from feeling like a repetitive clickfest.
More feedback on what you're doing right or wrong from your staff would help and more information on the opposition would be good too. For example there's no way to know if the opposition defence are playing deep or high up the pitch so no way of knowing how to set up your tactics and what players to choose.
The transfer window unlock is a great idea and one of the reasons I was so desperate for FM06. I thought it might be just like CM00/01. But the actual transfer market is pretty dull with never much going on. And it's still too hard to get shot of players. Please let us manually reduce their value like we could in the old days.
Ultimately the game degenrates into a succession of games where the only involvement the player has is in rotating the squad to keep players fresh. Once you've discovered a decent tactic there's nothing else to do except wait for January or the season finale if your team is good enough to be involved. There needs to be more reasons to to keep the player interested both during matches and in between matches. At the moment it's still the best portable management game by miles but it could also be so much better and most importantly so much more FUN.