[V8i C++] Getting the Visible Edges setting for a reference file

I've had a look at the the ReferenceFile C structure, the mdlRefFile_getParameters() function and also the newer DisplayStyleManager C++ class, but I can't seem to find the correct API function to extract the following info:

  1. Where the 'Reference > Presentation > Display Style' options are stored
  2. Where the 'Reference > Visible Edges > Cached / Legacy / Dynamic' column option is stored

Is this exposed anywhere in any of the APIs? Or is this another undocumented linkage ID on the reference element?