Many have asked the same question but the station currently does not support such a policy. It seems to be a question of additional cost and much more work -- translating and extra editing time to add subtitles.
The station's niche is to provide heritage language programming and although I'm not sure if maintaining local heritage languages is officially part of their mandate, that is undoubtedly the result.
There is a show on one of the OMNI stations (I'm afraid the name escapes me) where stories that should interest a wider audience are chosen from the entire spectrum of language shows and these are dubbed into English. This was also done with some Estonian stories.
I agree, if the stories had subtitles then English speakers would have a window on what goes on within the various ethnic communities and undoubtedly that would interest many but currently it's language for the speakers. This definitly serves to add value to speaking and trying to learn one's native tongue. Jõudu!