Go to >Settings>Preferences>
This will bring up a new menu. Click where it says: "Input/Codecs"
You will see a field that says: "Subtitle Language"
When you hover over that text input you are told:
"Language of the subtitle track you want to use(comma seperated, two or three letter country code)"
But the thing is I do not know what to put in that box. I tried EL for ELLINKA, GR, ELL and none of them save me from manually having to select the Greek codepage when I select the subtitle.
As for BSplayer I will check it out someday since the fact it has a media library and playlists makes it very attractive. But I am conservative when installing software I do not want too much crap installed on my pc.