http://web.archive.org/web/200104280...bindguide.html
http://web.archive.org/web/200112170...bindguide.html
Chardok was never bindable nor Karnors. Of course I don't have proof besides that link. It's not saying all that much. It's the best I can find.
I never thought of binding in ST. I don't see how you could if you couldn't bind in ToV. But I never tried it, so I'll take your word on it heh.