The method you are inquiring about unfortunately is not a supported method for editing the TermCFG.bin file. this doesnt mean some one in the community maybe able to direct to the desired result...
I was able to accomplish this using a VB .NET program that I created to programmatically open up the TERMCFG.BIN file, parse through to the information that I'm looking for, and then replace it with the right property value. It was definitely a painful process to go through, but it wasn't impossible.
I would much prefer that Wavelink had an SDK for or an API into the Emulation Parameters so that we aren't stuck trying to reverse engineer a lot of this stuff.