subtitle position - minus options

I’ve found that +1,+2,+3 options for subs are working, but they move the subs UP and not down. Usually the problem is that the subs are positioned too high (over the video), so you would want to push them DOWN and not further up. That way you can have the subs mostly (or fully, depending on the movie aspect ratio) in the black bar.

So my request = insert minus options as well (-1,-2- and -3).