As renoise has become an increasingly versatile instrument in itself, I’ve been attracted to making music (chiptunes) using only native renoise sounds. However, it becomes obvious as soon as you try to raise a short waveform to a high frequency that renoise currently has no options involving bandlimiting / other anti-aliasing algorithms. An option under “sample properities” in the instrument editor would mean everything for somebody trying to use renoise like I am, and is much less involved than redesigning a piece of workflow or adding a piano roll 
Feature request: bandlimiting / anti-aliasing samples