Manu,
On Mar 3 you wrote, " If the game is realistic according to gender & height, then everybody will take a 185cm male player" and "the height has low influence on the serve efficiency, else, everybody should pick the same ideal height"
I see a couple of ways to look at this issue...
1.) If everyone has the option to set their player's height like they want, what's the big deal if MOST of them decide to choose 185 cm? I mean, since on the real men's pro tour the average height IS about +/-185cm anyway (except of course, the Karlovics, Isners, Querrys and such, and the other end of the spectrum being the Rochuses) most of the 1st serves average between 120-131 mph. The Rochuses and even David Ferrer (who's about 5' 8"), can hardly go above 120 with any regularity.
2,) Even though some of the taller pro male players have become more athletic, the tallest STILL seem to have some lateral movement issues due to their higher center of gravity, so in TE the tallest players should have a bonus in serve speed, but a corresponding minus in lateral movement...
The opposite should apply to the shortest players (more lateral movement & less serve/return power)...THAT would be anatomically correct AND to some degree fair...
It wouldn't seem right for a 5'5' player to be able to serve at 145 mph AND have a bonus in lateral movement
In conclusion, we each have the option to choose what attributes we want our player to have, for whatever advantages we feel will best suit our chosen style of play...if most feel that 185cm is the "ideal" size in order to cover most of the bases, then that's only natural...If some want an advantage in footspeed, then they have to give up serve/return speed...if some others want to be 6'5" and above for a bigger serve/net coverage, then they have to give up lateral movement...
THAT's the way it works in real life, that's the way it should work in TE...
So, I guess I'm in agreement with Richard Gasquet, that big kick serves to a little player's backhand (especially a 1H) shouldn't get 93 mph returns back...if that's what they CHOOSE then it should be an advantage to the server...
The SAME truths should apply more or less to the women (Venus Williams kind of throws it out of whack with her height & athleticism)