Questions about weapons!

[Refplace]

Broken weapons and special traits
Sounds sensible. WM usually wont apply and Weapon Bond shouldn't but both work once you repair the weapon.

Signature Gear = unbreakable?

I think breakage counts as "vaguiers of adventuring"



"Flame on"… and off?

If an enchantment costs FP to use then definitely not always on. I would even say that is true if it is self powered through the Power enchantment.
But the Name enchantment can also limit things.

Flaming Weapon is IMO selective based on the first sentence under the enchantment.
"A weapon that flames whenever used, at no energy cost to the user."

You are not using it if its scabbarded.

Parrying atlatl-ed spears

I would call a spear or stone thrower a missile weapon rather than thrown so yeah, no normal parry.
Get Parry Missile Weapon skill for that.



Parry after a hilt punch with a cutlass

I think you have it right. Same as any change grip effect.



Dwarven whetstone and arrows

Seems reasonable. Though the whetstone only helps arrows with an edge, not blunt arrowheads.

Projectiles with Balanced = great bargain?

I think in shaping a rock to be "Balanced" you kinda resolved the issue.
A dedicated slinger should have skills and tools to smoothe, cut, and shape rocks. Or just make something with say Artist (pottery) and a kiln.





Silver bullets (and pellets, and stones…)
I dont think the mod means the projectile is replaced with silver. more like silver coated or plated.
But you could make solid bullets with the appropriate Smith or Armory skill. I would use the weight for material cost and labor as usual.