Well...you still have to compensate for the two (top-to-bottom, and the diameter one). Although, if one were to extrapolate from spheres, supposedly that's easier.
Me personally, in my dreams (the ones in which I build a pair of speakers, not the desert island with a bunch of hotties one), I intend to use computer modeling to figure out some sort of random based one that has the fewest modes, sort of like the Kharma ...Ceramique? Was it? I remember seeing a picture of the insides in a review in Absolute Sound.