When i start DotT or Monkey Island 1 (i don't have any other games so i guess it's a major problem) I have the same problem:
The upper screen shows the scaled picture and the right ratio, but the bottom screen is scaled vertically a bit and the proof is, that the scummbar is cut in the middle of the last verbs.
i did check the "correct aspect ratio" and "fullscreen" modes in the scummvm options but nothing changed. any ideas to fix this problem? it's small, but very annoying!
Actually, it's closer to the correct aspect ratio than the pixel-perfect one since most of the 320x200 games were supposed to have rectangular pixels as opposed to square. Except in the case of DOTT and some newer Scumm games...