2. If you need to create a complex environment setup inside Logic and want to control any (14bit plugin parameter), you have to create a "Dummy" Standard Instrument port set to IAC and use the CA to learn the outgoing environment midi data etc.
Example: Create a Fader object in the Environment using CC#12 out definition, cable it to a Instrument object which midi port is set to IAC and learn any Sculpture parameter which uses 14bit fader value.
Not really an efficient solution. it worked at first, but then it caused a whole bunch of problems, including causing my external controller application to quit. In logic itself, the controller assignment would it forget itself after a while. Nevertheless, I still think that there is a way around this issue, and your method at least shows that it might be possible