Regarding native synths, for example the TripleOscillator, it would be nice to allow a continuous change of its waveforms.
So rather than having a discreet change between sine, triangle, sawtooth, etc. a new knob could be implemented for this purpose.

In my opinion, its interest would be revealed in association with an automation track, an LFO or a peak controller.

Technically, I just imagine an extra knob associated with the already existing implementation.
In the TripleOscillator, the way to select waveforms is convenient, the extra knob would just allow finer control.

What do you think?