[FT]Building better(?) weapons

Hi
I've heard a proposed idea for a FT 3 that would allow players to design
and build alternate weapons based on the published weapon systems.
These would be simple formulae to alter the parameters of the weapon.
For example to increase range by 50% you double the mass. As in the
long-range pulse torp from the New Israel beta test page.
A corellation would be, that to decrease the range by 25% you therefore
half the mass.
Anybody suggest a way you can alter a weapon to increase the damage, i.e
beams that give 2 damage per hit or pulse torps that cause d6x2 damage.
My first idea would be 4 times mass, but that just seems too extreme.
Also how would you amend a weapon for half damage,  for example grasers
that cause d3 per hit. 

Tony