For sharing files with multiple custom display modes with multiple users, is there a way to embed the Display Modes into the file? or is the only option to export all display modes and import them on each machine?
Not actually embed them so they are easily used.
You could export as Dale suggested and I suppose copy the INI file contents to you Notes. Then to use it the recipient would have to be savvy enough to copy the notes and save them as an INI file, then import it to create the named display mode.
Obviously that would be Rhino version specific.