Ok, so some VSTs can take use of the volume column to send velocities instead of volume, but it's limited to 0-64. Some VSTs do other things with the notes if given velocities in the range of 65-127, though. Is there a way to send such velocities through using OpenMPT?
OpenMPT's 0-64 volume range is translated to MIDI velocity 0-127. You get the full range but every second value is missing.