I was playing around a bit in Bozja and noticed that even with a full set of haste gear the gcd timer didn't change for the heat blast blast in machinist. I tested and added skill speed melds to my MCH and also noticed the gcd timer didn't change.

This seems like a bug to me since heat blast is a Weaponskill, not an ability, and skill speed and haste should speed up all weapon skills.

Full disclosure: I want to see see six heat blasts in action during a single hyper charge