Hi Manutoo,
As you have asked to provide accelaration ideas, I have the following three ideas below :
1. Counter Attacker: Acceleration Speed bonus on the fast incoming balls but loses speed on sliced balls. eg. Hewit
2. Through the Motion : Acceleration Speed bonus when 'out of position' (stretching, sliding or on the run) but compromises accuracy. eg Djokovich pulling off running full stretched winners.
2. Needle Threader : Acceleration speed bonus on hitting passing shot (opponent at net) but less speed when opponent is on baseline. eg Agassi playing vs Sampras