A few ideas here for the wavetable editor:
1. The ability to set morph points in the wavetable.
So say for example you have a wavetable of 16 waveforms, you could select the morph points as waveform #1 and waveform #8, then select the "Morph Wavetable" option from the menu and have it morph from #1-#8 rather than morphing the entire wavetable like it does now.
This would allow for creating more varied wavetables.
2. The ability to import a wavetable and have it attach to the end of the currently loaded wavetable.
So say for example you have a wavetable that is 8 waveforms long, you could then import another wavetable that is 16 waveforms long, and the result would be a wavetable that is 24 waveforms long with the 16 being added to the 8.
Maybe the function could be called "Add Wavetable" or something like that, and as for which format types could be imported, maybe for the sake of simplicity only allow ones in the Dune format to be imported. That way it would serve as another way to create more varied wavetables, for example: Create wavetable A, export it in DUNE format, then create wavetable B and for more variation use the hypothetical "Add Wavetable" option to import wavetable A to the end of wavetable B.
Just a few ideas for a more robust wavetable editor!