Thrown & Missile Weapon Talents

[Sinanju]

So there is a Thrown Weapons talent that gives +2 DX for thrown weapons. There's also a Missile Weapons talent that gives +1 to +3 DX (if bought more than once) to missile weapons.

Stones are listed on the missile weapons chart. So can you use Missile Weapons talent with thrown stones? And if so, do the talents stack? My gut reaction is: no, they don't stack--but you could buy Missile Weapons talent for thrown weapons, assuming you had strength enough that it wasn't pointless.

I want to simulate Fezzik's (from The Princess Bride) ability to throw stones with great accuracy (and power, given that he's a [small] giant).