My own opinion entirely, but I couldn't say I was all that impressed with the sound of the wavetables in the demo @ Namm. Reminded me of the kind of 'tones' that came as standard on a cheap Yamaha PSS-470 home-keyboard 20yrs ago!
...I don't tend to touch the waveshapes on the Virus B either, because of the same thing, even when they're filtered and drastically modulated in at an attempt to make them sound less dull.
Select a nice patch, and exchange one of the basic waveforms for a digital waveshape and hey presto it instantly turns it into "Casio home-keyboard" mode.
eww.
However, if you could import your
own PCM wavetables....

I'd import proper waves (like saws, squares with different characters, etc.).
How do wavetables work, exactly? Are they multi-sampled, single-cycle PCM waves? Or vectors, taken from a high-definiton "fingerprint" waveform which is programmed to be re-created at whatever pitch/note is pressed?