There should also be a module for taking reduced damage when ramming (I am thinking for shields).
Also, one for increasing targeting ability of weapons. This would be accuracy for ballistic and energy weapons, and tracking ability for missiles.
Also, a module for increasing the turret arcs (on applicable ships, this would be pretty sweet).
And, how about a module that makes your ship mirror-like, reducing armor (or mobility) and making your ship reflect lasers somewhat.
Oh, and my FAVORITE ideas? How about two modules, one that makes your ship attract nearby ships, and one that repels? It would be SO COOL if you could have/turn on a tractor/repulsion beam, or aura.
Also, I think that some modules should really increase the mass of your ship! Especially Heavy Armor!