MIDI mapping using custom key ranges

is there going to be key mapping tab in all plugs? IE a way to set up the what keys the instrument plugins play on if you want a certain rage of keys to play and those are the only keys you want to play. you all ready have a root key with the green box. the default root key should be middle C the default key zone C0,B8.
example 1 TripleOscillator root key C5 key zone C4,C6.
example 2 TripleOscillator root key C5 key zone C5,C5.Key
Key Mapping tab mockups

the left side of the blue is low key
the green box is root key
the right side of the blue is high key
http://youtu.be/6v5VKBuMdlQ?t=7m59s
you be able to play multiple instruments from one keyboard, with different areas of the keyboard playing separate instruments. layer should be able to used B&B and soge editor.

Start by reviewing the key-mapping mockups and the existing plugin handling for root keys and key zones. Done would mean defining and implementing a consistent mapping interface for instrument plugins, including separate ranges, root keys, single-key zones, and layered instruments.

Written by the indexing model from the issue text.