I gathered some data on Barrage, attack speed and multiple projectiles. It behaves inconsistently.

Bad coding?

Anything new regarding this that has come to light?

I'm going to Necro this shit hard; with the addition of Assassin and probably even more CoC builds, I want to see an update to this. I messaged Mark and look forward to a response but these issues need to be addressed.

They are especially important in regards to the Volley Fire jewel; are they worth it? How many are ideal?

I crunched a bunch of numbers and based on these mechanics even a SINGLE volley fire is wasted as the chance to proc a single CoC linked spell is something like 97% (with 91% accuracy) thus making any additional projectiles redundant.

Need more clarification to check my math.