You could use keyboard shortcuts:
Ctrl+Left/Right:
. Subtitles time correction -/+
. VobSub subtitles dec/inc delay
Shift+Left/Right:
. Subtitles time correction -/+ (small steps)
. VobSub subtitles dec/inc speed
or you could re-sync using e.g. SubSync:
http://forum.bsplayer.org/viewtopic....468909c42#1574