Hello again,
Just read the bits about specials briefly, and here goes with my understanding of how they work .... as Jynne says the specials always hit, they have their own formula for calculating damage, which is usually just as in the case of Burst, a 3x roll on the weapons normal damage. I have a feeling that they are subject to Crits however, but it just doesn't say it has Crit'ed due to it being a special. (I've noticed my MA doing 2 levels of brawl damage ... I've come to call them a normal brawl and a crit brawl as the damage difference would signify this is what is indeed happening!).
The special skill you use simply cycles quicker with the more IP your pour into it. You can therefore consider your special skill as a kind of Init for that special. Therefore Fixers with huge amounts of Burst, will be able to Burst more frequently than those without, hence more DoT.
So yes, pouring IP into specials such as Burst or AS or Brawl is a good idea to increase overall damage output.
Anyway I hope this helps somewhat!
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Major headache of Opposing Force
"Not a rant, not a flame. Just another perspective."