And, although the Heat Cannon is a great weapon in general, the Rocketeer is too sluggish to use it effectively like you can on an Infiltrator or Scout. And EOC's... there's just nothing sneaky about a Rocketeer to make this a good fit in my opinion.
The Rocketeer is a one mech personification of Hawkins problems. Yeah, it looks/soundss awesome but holy fuzzy bunny some of this fuzzy bunny just dosn't work the way it should and it just looks like there is all kinds of things that are missing. Not to go too far off topic with it but the Rocketeer really needs other weapons besides the Seeker to compliment its play style, and these weapons don't exist yet (the SA-Hawkins would be ok though).
To bring it sort of back on topic a better dumbfire for Hellfires could only help the Rocketeer out of tight situations as escape is never going to be an option.