Roped weapons: You appear to be using the same mechanic that 3.0e used for the whip -- you're treating what is really a melee weapon as a ranged attack. In the case of the single-headed meteor hammer, real examples have ropes (or chains, but usually ropes) up to 5 metres in length. In other words, there isn't really much reason not to treat it as a weapon that can attack any target up to 15 feet away, and give it to weapon finesse quality so you can use Dexterity to make your attack rolls.

The double headed meteor hammer (your "dire" version) typically has a rope up to 3 metres in length (traditionally 2 metres). Again, we can treat this the same way.

Incidentally, based on wikipedia's 3 kg for the single-headed version, you've got your weights way over budget.

If you are going to insist on making them exotic, they should certainly also be monk weapons.

Atlatl: Just to add to your historical notes, it is called a woomera in Australia, and examples from prehistoric times have been found across Europe and North Africa. I think your damage is a bit high on this to make claims towards realism though.

Lumber axe: How is this different from a throwing axe?

Hammer throw: How is this different from a throwing axe?

In the above two cases, I accept the game stats are different, maybe even very different. But given that physically these weapons are almost imperceptible from the SRD weapons of similar names, why do they have such superior performance?