I haven’t come across this kind of feature in Renoise. If anything like this isn’t implemented yet, I still believe that it could be useful for somebody. Having Renoise to insert sample-specific default pan value to the tracker roll for each note in any sample or note in any instrument would make creating stereo drumkits easier. For example, if I had six different tom samples in a single instrument triggering from different notes, each note (or at least sample) would be automatically given a panning value that is specified in, for instance, instrument editor. This way I wouldn’t need to manually insert pan values for each note. Currently, the only panning control I’ve came across controls the entire instrument and it doesn’t suffice.
Same applies for volume/velocity also. Some synthesizers have MIDI patches with velocity-switching or velocity-controlled filter. I’d like to see a possibility to give other default velocity values than unspecified (practically 7F).