So, i'll start.
1. Short-range repulsor. The idea is simple - a beam that stops ramming stuff (Uln and other missiles
): with range less than current Repulsor's 4 km, longrange<1, radius and stability time greater, also somewhat weaker overall and cheaper. As i mentioned here, a good thing to put into little turrets. Of course, both usual and this type of repulsors can be paired with normal beams anyway.2. Rockets with good warheads. Let's take a look at our rockets and Razor?
Swarm ammo: 10x for 80 Cr; damage 20, speed 4000, volume 0.25; Hail ammo: 4x for 90 Cr; damage 30+2, speed 3150, volume 0.25
Razor ammo: 50x for 4000 Cr; damage 120+12, speed 3600, volume 0.02
So, why they don't make rockets with Razor-like warheads? Those would cost 4x-6x times more than Hail, but it's still far from prohibitive: 4x damage, 6x phasedamage and a Medium mount freed for beams are worth this.
Acceleration from a typical rocket booster seems to be tolerable. Maybe mini-fusion shells need to be charged when firing, then it would have either non-zero energy requirement or a kick-start power source in the rocket itself, thus sacrificing some volume. But even with volume 0.5 (like Photonswarm), a mount would still carry 2x(+3x) greater total firepower than with Hail.
More for Reaper, but AM may require a little storage power or something, so i left it alone.