That feels like a half measure that benefits larger ships over smaller ships. Large ships can support a lot of point defence turrets that can (will be able to) shoot down missiles. Small ships will be forced to constantly turn around to shoot missiles down, rather than rapidly changing direction to avoid the missile. I'm hoping the damage pulse can be used to hit missiles. Could be used as chaff.
It's easy to put a tiny PD turret on the top and aft of a 100-mass ship. You need only:
1. Core
2. BOBBY Artificial Idiot Module
3. Damage beam computer
4. Damage beam module
Optional:
5. One or two shield capacitor(s)
6. One or two shield recharger(s)
That's 4-8 blocks. If you're a little creative you can make them look halfway good too. Don't worry. Your fighters are at no disadvantage. :D
cceleration refers to a change (usually an increase) in velocity - it has no bearing on direction. Changing direction is changing direction. Increasing speed is usually referred to as acceleration. You can accelerate in a direction, and you can change the direction you are accelerating in, but 'acceleration' is not a term that refers explicitly to - or one that even implies - a change in direction.
Velocity is a vector, meaning it has both magnitude AND direction. Acceleration, technically and correctly, is a change in velocity. Velocity includes direction and acceleration changes velocity. Therefore a change in direction (of movement mind you, not where you aim your nose) is technically acceleration.
"Acceleration" referring to an increase in speed regardless of direction is more of a car term (Antonym: deceleration). This definition of "acceleration" should not be used for space ships where vectors are far more relevant than linear speed. If you use the car definition for space ships you will look silly and confuse people, so please don't do that. :p