Variables

The option to use in-game values (like Speed, fuel, altitude) as values for parts, which would help with cockpits, with better gauges, and (a very specific example), using a modded flare with the eject force set to the speed of the aircraft as the P2V's smoke canister MAD marking system, and the option to add equations, for example a dial showing max range at current speed, altitude and throttle setting.