Physics impulses from missile impacts
Giving missiles the ability to "push" ships on impact, depending on the target's total mass relative to the total number of impacting missiles and the mass of the target, could produce interesting gameplay scenarios.
For example, firing on a small trans-orbital craft with multiple missiles as it hovers above a landing pad would slam it down into the pad from the force of the missiles. Hitting a craft with missiles as it makes a turn could send it spinning into the side of a valley or hill if the pilot can't recover in time.
Combat would feel more realistic and cinematic if this were to be implemented correctly.