1- add a Data\Court08\Court.ini . Only [Physics]SurfaceSpeed is used by the game engine, ignore all the other values. Set SurfaceSpeed to -0.5 if you want it to be slower than the actual one.
Add the reference to [Court] in the Tour.ATP & WTA.Ini, and in the tournament you want to change .
Add icon Menu\Art\Ico\Court07.tga & Court07s.tga, and background Menu\Art\bg\Court07.jpg .
Add the references to these files in Menu\Global.Def and Menu\CourtBg.menu (I just added them, so they'll be there in next update of TEM as well)
2- [BonusSkill] values were used by TE2006 to compute the rally force of the players, thus the service is 0
3- yes, and raise the mental skills as well ; read this topic for more info : https://www.managames.com/Forum/ftopic953.php
4- yup, a good bunch of birth dates are random, not real ones ; if you want to fix them and send me the updated Players.ini , it'll be quite welcome !
5- Answer is in this page https://www.managames.com/Forum/ftopic953-30.php
, look for "doublespirit" .