I dont see why you would make a active weapon rule. It sort of limits the types of robots you can build.
A solution to the problem would for people to build robots designed to defeat rambots and the like, or to encourage people to build a robot with a weapon.

As for beginners no being able to make a active weapon, its not too hard from what i can see. Im building my first featherweight with a axe and i know exactly what to do thanks to people on the forum. I actually would find it too boring to just make a rambot anyway.