Engineering of the FSD should only effect the Blue-Zone which would do notionally three things:-
- Reduce integrity loss for operating SC optimally and outside of the blue-zone (the further you are outside of the blue-zone the more integrity loss is incurred - at least IME)
- Reduce super cruise times by some indeterminate value (would not go as far as to say a factor) for blue-zone jockeys
- Reduce super cruise times for SCA assisted travel
In essence, the key advantage would be less integrity loss when piloting SC efficiently - no tangible gains to speed/acceleration potential.
The potential module improvement option could be a mass effect diffuser (or something like that) - essentially reduces the effect of system mass objects on the super-cruise. This could potentially result in faster travel times but a lot would depend on the pilot since the risk of overshooting is likely to be greater without SCA. It would also notionally have greater energy demands on the system PD as well as on the PP, fuel consumption in super cruise would notionally be increased as a direct result.