Hi,
I think it would be a good workflow improvement to be able to select ‘Init to current Split’ and ‘Generate Drum Kit’ (from the instrument editor screen) from the right click menu of the Instrument / Sample table.
i.e. from the menu displayed by right clicking here:
This could be hacked up with a script and iterating through the renoise.song().instruments[].split_map[] table but that would just be duplicating the functionality already available in the Renoise code.
Another option would be to expose the functions available in the following section through the Lua API (hint 
)
Martin