Is there a way to type in my own definition of the audio stream?

A movie that has 3 commentaries, I'd like it to read on the screen Cast commentary, Producers commentary and John's Commentary instead of audio or audio 1, audio 1, and audio 3

Under extension or language in ifoedit, it won't save if I use the anything not listed in the dropdown box (won't even save anything in the extension one even if it's the dropdown box)