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You could always do it with a bit of scripting:

exiftool  -q -r -ext jpg -if '
    $ImageWidth > 1000 ||
    $ImageHeight > 1000 and
      !print "$Directory/$Filename\0"' . |
  xargs -r0 sh -c '
    for file do
      mv -i "$file" "$file.back" &&
        convert -resize "1000x1000>" "$file.back" "$file" &&
        touch -r "$file.back" "$file"
    done' sh

Here resizing the images so they fit into a bounding box of 1000x1000.

• exiftool is used to find the images that need resizing
• convert resizes them (doesn't touch the exif info)
• touch -r restores the original timestamp from the backup file