1.) At first try i was afraid to don't be able to kill any enemy tank anymore
But after few try i have found the way to use it, and i found it better than before but there are still few things to improve IMO.
2.) About the acceleration everything is good IMO, you now feel to handle an heavy and mechanic activated tank turret when you start to move it and this stick more to the reality of real WW2 tank. The main issue is the deceleration due to the sliding effect. I'm all for having a slow rotation turret speed but IRL when the shooter of the tank was stopping to action the rotation of the turret, the turret was stopping instantaneously to move. It's a mechanic effect so there is no slide effect at all. The issue in FH2 with that is the aiming accuracy has been impacted by this change and it's still the case IMO whatever your mouse sensibility setting are.
3.) Yes but it need to be improve again (my average ping is about 20) :
Good point = more realistic, more chance for infantry to flank heavy tanks and avoid to have crazy turret (360° overall in few seconds...). Also it add a real weight turret feeling.
Bad point = it's decreasing to much the aiming accuracy especially on tank like the Panzer IV, Puma...etc... It seems to impact more the medium and light tanks than the heavy ones.
4.) Yes, now it's always hard to directly stop your sight on the enemy, you have to calculate a kind of delay to try to aim as more accurate as you can. In fact you have to stop to move your mouse (I'm using mouse for turret rotation) before to be on your target to try to put your sight on it at first try. Which is if you fail a major issue because the quickness of aiming and firing is the most important fact is tank combat.
What would be grate is to keep this new effect of acceleration but to find a way to instantaneously stop the rotation when the player stop to action it. It seem that you can't keep the old deceleration with the new acceleration due to the BF2 engine so what i could suggest is to add a new button in tank control panel to stop the turret rotation. It would act as a brake on the rotation and the player will have to press it at the good moment to be directly on is target and to avoid the slide effect, but i don't know if you can do that.
Hope my feedback and suggestion will help you.