It's really no big thing.  Hiding/unhiding channels is just a keyword flag (hidden 0|1).  This has no bearing on whether the targetGeom channel can contain or be filled with morph deltas.  The thing about INJ channels is that it uses the readScript keyword to fill the morph deltas and unhide the channel/dial from separate pose files.  IPB just need read the delta set from the separate file and can safely ignore whether or not the channel is hidden or not in the other (and always just set it to be not hidden in the app).

In other words, nothing amazing.  It just seems amazing since Poser, as usual, provides none of the editing functionality that would let you do this as in these third-party solutions.  I'd really like to see Poser step up and have the ability to edit things like master-slave connections and dial visibility.  They can add a super-cool and powerful shader node system, but not a simple master-slave editor?  Very odd.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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