Hi
CMI V have the Spectral Synth mode, that offers some possibilities to create waveforms.
What would you like to be able to do with your waveforms in CMI V? Why is your suggestion for CMI V? CMI V have limited soundshaping parameters. It's not a synth as such.
I have for example suggested Arturia to create an emulation of Ensoniq Fizmo that use transwaves synthesis. That would be a real synth using transwave synthesis. Would'nt that be better?
After all a synth sound is about more than waveforms.