ajsmicko it depends from the type of the subtitles. If the subtitles are embedded in VOB (DVD) or Matroska file, then it's not possible.
Also, it's not possible for the "Keep aspect" resize method, because in this method there is no black space under the video (your player adds black space if necessary, but the video itself does not have black space).
The subtitles can be under the video only when using "Add borders" resize method.
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And this is for everyone: I just released another update for viDrop -
http://www.vidrop.vpunk.co.uk/vidrop-0.57.4-install.msi
I had some reports of mencoder.exe suddenly disappearing from the viDrop installation folder.
I suspect this is due to some stupid Antivirus programs detecting mencoder.exe as false positive, because it's UPX compressed (
http://en.wikipedia.org/wiki/Upx ).
This is why mencoder.exe and mplayer.exe are no longer compressed. This will lead to a bigger installation size ( ~10MB bigger), but I hope it will solve the problem.