For multilanguage you can use:
VGameVideoSubtitleFont (for the font)
VGameVideoSubtitlePosition (for the subtitle position ] default was bottom)
VGameVideoSubtitleLanguage (for the subtitle language)
and
VGameVideoAudioLanguage (if the MKV have different audio tracks)
Simply use the ISO 639 to set the languages. MKVtoolnix sets the ISO 639 too.
http://wiki.visionaire-tracker.net/wiki/ISO639_Languagesfor example:
game:setValue(VGameVideoSubtitleLanguage, de)
to set the Subtitle language
game:setValue(VGameVideoAudioLanguage, de)
to set the Audio Track to german
and we have:
VGameSpeechLanguage
for the character output "speech (audio)" language (if the language exists).
More examples?
