There is a missing feature, which could save alot of time, when you create multi sample instruments. As far as i know, its currently not possible, that renoise auto map the zones for each sample, so the root note wont be changed and the note range will be optimally set.
Example:
From this:
5672 
To this:
5673 
I know, this could be done via scripting, but i think this should be natively supported.