mkvmergegui - How can I assign specific subs to different audio choices?

[djmasturbeat]

In mkvmerge I would like some help in figuring out how to assign specific subtitle choices to specific audio when that audio is selected. for example (for a dual audio anime): assign signs-only subs with the English dub 2.0 and English dub 5.1 tracks, and assign full English subs with Japanese audio. I still would like these to be able to be turned off (not forced) from the player if so desired. thanks for any help. apologies if this is better located somewhere else. please feel free to move this =)

[Selur]

you can't (matroska specification doesn't support something like that),...

[hello_hello]

If the matroska spec included something like that, what's the odds of any player supporting it? Even the forced subtitle flag seems to be universally ignored by players.