Value (default) = 5 (seconds)
Value (proposed) = 2.5
One would need to identify which engines are equipped by the light fighter class.
Not hard to do.
As for making larger ships have larger ramp up times for cruise?
Nice in theory - but with cruise disruption and Train CDs - a large ship would NEVER escape combat.
I offer the differentiation to help LFs fulfil their role as interceptors.