1- coz some mental skills are very different from each other, and thus, can't be regrouped through a bulk training
2- coz physical skills are not trained directly but through different exercises which all have different impacts on several physical skills
3- I'll see what I can do...
4- A few hints here :
http://www.managames.com/tennismanager/ ... tantskills
For more help, I guess you'll need to ask people who played the game a lot..!
5- yup, I'll add something on next big update; it might not be a new bar, but a little indicator on a current bar (probably on the Short Term Form bar)