tis a good mod, but i have a suggestion.
if its possible to read the max rpms allowed in a car, IE redline rpm, you should consider making the shift rpms a function of the max rpm.
for example, the lx6 redlines much higher than the uf1.
generally speaking, 1/3 of redline is a good place to shift if you are simply driving easy, 1/2 if you are gettin on it a little, and full redline if its floored.
i dont know if its possible to read this info from the game but if so i think it would make it much more realistic rather than having to change the info for each car you drive...
but all this aside, i commend you on a great program...
its a lot of fun for cruising