I messed around with that before, some fun things to try:
1. Make the other Engines useful by making Acceleration a factor, Engine 1 accelerates real fast, good for fighting, but has slower top speed, slow down the Acceleration of Engine 3 so it takes a bit to reach top speed. I think I made Engine 2 have the top speed as 3 and made 3 a bit faster.
2. Change the Large Pod to have the Capacity of the Largest Pod, and make the Largest Pod have 2 slots of 75 instead of 5 slots of 30. The "Ore Run Pod", I think I did something similar with Small and Smallest.
3. Change the amount of weapon slots a moth has to balance it out. NT has 3, Swallow has 2, can't remember the rest.
4. I also changed the recharge of the cells to make them useful too.
Good Ol' Gaming Hardwar Server UIM06 Long Term Fresh Start 06/14/2020
Never messed with it myself, but someone I think Prophet gave me a modded one that had engine 3 set to the same as when the afterburner was used. I know, not practical, BUT it was fun racing around Titan, especially when using afterburner and the afterburner fuel cells mod! I think that the AI still followed the original speed caps though. :/
Edit: After looking at the top screenshot, I wonder, did MASS actually take part in anything or was it just there for show?