They already have this in Kontakt 4. I don't think it's that bad setting up Kontakt outputs...
I didn't explain that well...
From the NI website:
16 CHANNEL BUS SYSTEM The new 16- bus system introduces comprehensive routing options with integrated insert and send effects. This is a powerful tool for creating detailed effects chains within an instrument. For example, when building a drum kit, you might want to use completely different effects on the kick, toms and snare, while still sending the whole kit to a stereo master channel. Now you can.
It's not hard routing simple stereo instruments in Kontakt.
But if you're dealing with multi-channel instruments... Kontakt 4 isn't the most flexible.
ie: There's no means of "down mixing" multi-channel instruments to stereo outputs with EFX.
If I understand correctly, this is addressed with version 5.