How about making Renoise able to render 96khz samples into sample slots so that rendered sounds sound the same as when playing in 96khz?
That’s not a bad suggestion. Even better would be ‘freeze/lock tracks’ 
Yes, maybe indeed, but I believe track freezing has been discussed here before and the conclusion was that there are dozens of more important things to do. But It would be nice yes.
But I could settle for a 96khz rendering for now. 