Okay, if I mentioned everything there is to mention about skills right now my fingers would fall off, but I'll give it a high level shot and then we can dig down in further.
Let me start by saying that the Coach Skills (also referred to as Develop Staff) feature is one of my favorite in the game as the skills add an entirely different way to play NFL Head Coach 09. Just as players earn points in Career Mode towards leveling up their attributes, coaches (coordinators and positional coaches have their own set as well), GMs, and even your trainer earn development points that they can spend on enhancing skills throughout their tenure as a staff member in NFL Head Coach 09.
Each skill has a unique effect. For example, there is a coach skill that affects how good your team is at calling the correct play for a situation in a game. The Performance Skill affects how your players perform on the field. The Trainer Rehab Skill controls how quickly you are able to get players back into a healthy state after an injury.
Now, over and above that, there is an entirely separate class of skills called Special Skills that each coach, GM, and trainer can purchase with his development points. This is the Tree Screen that you've have seen in videos. These Special Skills (~60 in all) control very targeted aspects of the game and are very powerful. The Motivator special skill for example will increase the potential of every player on your team at the time of purchase.
Okay, my fingers are starting to shake, couple other quick hits:
- Skill levels and which Special Skills you have will affect your coach's overall rating.
- You have to be careful when making your staff to0 good as they might attract the attention of a position on another team. Now you have to play against the super-star coordinator you brought up who, by the way, will retain all his skills when he goes to the other team.
- CPU teams purchase their own skills, but as the user you have to manage this by yourself, there is no delegation of staff development.
Whew...hope that gets the Skills talks started!