Its simplest not to include them in the actual container. Just rip the subs as vobsubs and you can switch between the languages, or name the subs like:
movie.year.blah.avi
movie.year.blah.ENG.srt
movie.year.blah.FR.srt
and you should be able to switch through them that way.
If you want to mux in subtitles into the actual container, you might be better off using a container that supports extra streams. MKV is a decent enough one, although standalones tend to be picky. Then again, if you cheap out on a standalone that's what you get
