How to move subtitles on the very bottom

[Meluzin]

Hi everyone
since the videos usually have different ration than the monitor itself, there is a black stripe on top and bottom. Naturally, I want my subs to by displayed inside this bottom stripe.
BSPlayer allows to move the subs (Shift + Up/Down), but the minimum is 0 which starts where the actual video movie starts, not where the screen starts, so the subs are still in the picture, which is bit disturbing.
Is it possible to somehow move the subs down bellow the playing movie into that "useless" black stripe:)?

Thx, Tomas