Knobs 'n' stuff

I’m looking around for music control surfaces, leaning towards Behringer’s B-Controls, especially the flying-faders-equipped BCF2000. But I have to wonder: are they going to come out with a daddy unit for this series? Like a box that contains the faders version *and* the rotary one? Or 2 of each? And if not, why not? In any case, could I just buy the bits and stick ’em together in a bigger case? Watch this space…