Yes, it would be great to be able to practice serve.
My ideas:
Option to practise just serving in the practise menu?
Could practise count towards your form points?
Ability to hit a well angled winner (i.e the shot lands further inside the baseline but still with a winning angle)?
Possible bug - when I save a match and then re-open it later, I never seem able to use the accelerated serve for the first serve on the first point?
More stats such as head-to-head details?
Wider viewing angle? I'm often out wide and not able to see myself!
Maybe an increase in the number of acclerations, possibly earned through practise?
Great game, looking forward to TE 2008!