One of my friends who's a big fan of drakes recently had me read two of the SR3 books which describe them.
I think one of them was dragons of something, and the other threats. All in all about dozen pages or so (including one of those shadownet fluff sequences).
But one of the big things which struck me was that they were highly hunted. Besides a little short comment in the description about how there are people interested in them... this is barely addressed in Runners Companion at all.
I'm a little curious, have things changed in the timeframe from SR3 -> SR4. I honostly don't see the fluff changing.
At the same time, if drakes gained the Enemy5 (+25BP) and Wanted (+10BP) qualities automatically in addition to the Drake (-65). The net of +30 seems a lot more comparable (especially if those negatives don't count against the +35 limit), and comes very close to the chargen rules I saw in there for them. (in the SR3 books I think it was roughly 25 or 30BP quality or racial priority B, but you automatically gained enemy6).