Does projectile damage increase fireball?

I'm running a CoC spectral throw/fireball shadow

and wondering if +projectile damage increases fireball's damage; I know spelldamage does.

second question. I have this gem: and I know recently they've started making gems that are like keystones, so I was wondering if there is a keystone for that gem.

Final question:
Where should I go next? Spectral throw cast on crit with fireball :) I don't know whether to go deeper towards the dex side (ranger) or towards the int side (spell damage, and more crit) or str side

Thanks!
My tree:
http://tinyurl.com/pgvld4k

If it says "Projectile" on your Fireball skill gem (it does) then it benefits from anything that benefits projectiles.

That includes the 20% projectile speed from the notable passive in the ranger area.

"

Shagsbeard wrote:

If it says "Projectile" on your Fireball skill gem (it does) then it benefits from anything that benefits projectiles.

Ironically, bow attacks seem to not have the projectile keyword.

"

GeorgAnatoly wrote:

That includes the 20% projectile speed from the notable passive in the ranger area.

I don't cast fireball, cast on crit casts it.

I use a dagger and shield. I'm thinking of going for the Adders Touch circle. Gives me damage, attack speed, and crit.

I'm thinking of going for Elemental Domination. I get Spell Damage nodes on the way.

Life, crit and allres nodes are good ;)
I did not find any passive that has 'domination' in its name though?