I think it would ease sound design if oscillators 1 & 2 had independent volume controls before the mix stage. Especially with the wavetables, some oscillators have quite different apparent volumes.
Also, it would be nice to be able to change the way the crossfader blends between the two (crossfader curve). It sounds to me that in the middle position both oscillators are at full volume, meaning that a patch modulating the crossfader will rise and fall in volume.
Unless, of course, anyone has any tricks to compensate?