well i made a mod for myself that changed speed of light fighters to be faster, heay fighters a bit faster, and very heavy fighters faster and slower, and feighters quite a bit slower. Light fighters now go from 100 (starflier) - 140 (banshee) heavy fighters 85 (liberty defender amongst others) - 100? or was it 95 not sure which but i made the valkerie and stilletto go that speed, and then for very heavy fighters it ranges from 72 (eagle) 82 (sabre) 90 (titan) and freighters 50 or 55-65 so yea i've had no problems as of yet, and also i made my thrusters go from regular thrusters at 100 to advanced thrusters at 160, so the fastest you could ever go with afterburners on would be 300 speed in the banshee. It works pretty well for me
. Cruise flight is still 300 though as i've not found a way to change it yet.