The Pitch nose down for increased speed was something we played around with but was removed from HD (it increased speed by around the equivalent of a speed notch, so if your ship has top speed 7/10, pitching down took it to 8 etc) we altered how it worked from pure to pulse but it was something that we werent ever 100% with

I'm not sure what 'rubber band speed mod' means though....
Unless it means rubber banded AI, or catch up system, of which there is neither.