Regarding length – yes, we could potentially make it longer. For this first H9 Plug-in Series release, we did not want to stray too far from the H9 algorithm, but we could revise the length at any point if desired.
Regarding feedback – we played around with a feedback control when designing the UltraTap H9 algorithm. We found that the Slurm and Chop controls were much more exciting parameters. Feedback would be nice, but I don't see us adding it.