Ok the title is not super clear I guess. I'm going to try to explain myself:
This would be absolutely incredible for the sampler module to be able to act as an input buffer, just like the delay module does I think (I guess it acts like a circular buffer).
It would record like it already does but continuously and within a fixed length buffer.
With the already existing ability, with a MultiSynth and its phase parameter, to get chunks of the "sample", it would expand homemade filters possibilities a lot (like, really a lot).
With this option to the sampler module, we could easily build live granular filtering, granular reverberation, a lot of other granular or non-granular stuff.
I was thinking of this as a sampler module new option but it could actually be an other module, a mix of the sampler and the delay modules I guess.
Hope it was clear enough !