I’m afraid I don’t have any crazy ideas but the most important things with sample manipulation are the ability to reverse, snap to zero crossing, being able to slow down and speed up without losing the harmonic quality of the sample, and being able to add variation. On that last point I use the Simpler in Ableton often on percussion samples and use LFO’s to do subtle modulations of pitch, volume, filter and panning to create a bit of movement or interest in a sample that may be repeated. Overall I don’t need fancy shit just the ability to do those things really well. Being able to use all of the amazing modulation facilities of Circle on samples would be great thoughand this feature I find very exciting. Overall, for me the modulation stuff you have is the best element of the current software.
I generally use Simpler/Sampler in Ableton, Kontakt and Robert Henke’s Granulator or just manipulate samples using the various algorithms in Ableton and do manual edits. Anything you could incorporate from Granulator would be great - it’s a fantastically creative tool.