Some ideas and suggestions
2: Can you introduce continuously variable valve timing alongside your current VTEC-style VVT? It would help smooth out power and torque curves, and is fitted to most modern cars. It could work like the current VVT sliders by pinning maximum and minimum cam profiles to the engine and then smoothly varying the profile between the two settings as the rpm increases.
3: 0-160km/h times would also be quite nice to add.
4: Have quad turbos and twincharging already been mentioned?
More suggestions may be added here if not found easily elsewhere in the forum.