DVDFab Manual for Mac
DVDFab can preselect subtitles based on the specific language. These pre-selections also can be reset at Main Interface at the subtitle selection box.
If you dot the button at the top of this window, no subpictures will be pre-selected, which means you need to select the subtitle streams you want before each task. Moreover, check the subtitles you select to see if they are commentaries or directors' descriptions or any other special features, unless you intentionally need them.