Oh well, too bad that it is not a priority but I completely understand as you must be very busy with development of te2007 and trying to keep everyone happy!
I am very happy that you also seem to think that lowering the importance of the acceleration feature is a good thing!
Here's an idea for modeling the game based on real world data: compute the average of length of rallies (number of shots back and forth) played by the pros before a point is won (I am not sure if the average or median would be the better stat, but these stats may be computed per point or game or set, etc).
Now, compare that stat (or stats) with the average or median length of rallies in te2006 (between online players) and I am willing to bet that when acceleration is used, the length of rallies are much shorter than the real world.
I, for one, find it very exciting to be able to rally and work hard for each point ... which reminds me .... what's with the serve heavy element of the game? With the current values one can win entire games or sets by serving hard enough .... I can't see that being the case in pro tennis.