Would haveing a pitched roof in my control room be a bad idea ?

Well, a sloped roof sure beats having it collapse due to the weight of snow!

Plan on putting some insulation up at the peak. The regular old pink fluffy kind. It'll make a nice bass trap.

Norrie,

roof or ceiling?  It is a little unclear. 

But a sloped ceiling looks good and gives a better sense of spaciousness.  Along with the insulation you can make panels, too, for bass trapping.  Hang them so that they catch sound coming up and anything reflecting back down.  A two fer one, just like corner bass traps.

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I'm not an expert on sound reflection and room sizing and shape, but it seems to me that non-parallel surfaces would be better than having parallel surfaces that allow precise standing waves to be set up.

Isn't that the reason we use the bass traps and other sound shaping items like curtains and carpet?

I think a sloped ceiling not only looks better, but also breaks up those parallel surfaces that are the bane of sound techs. 

Turns out the non-parallel surfaces thing is mostly myth. What it can do is reduce flutter echo, but that is easily treated without resorting to the funhouse architecture often employed in studios. And what it doesn't do - contrary to the myth - is address the most common and much more difficult issue of room resonances. All it does is make them more difficult to calculate.

The point I was making is that corners are the best places to absorb low-frequency energy, and the apex of a pitched ceiling is an excellent place to do that because you can stuff 2 feet of insulation up there without it getting in the way.