[QUOTE=olc;74383]When I chose the remux mode for ripping BD, the render directly yo video is not there. Is there some way to get a subtitle track, especially the one with forced subtitles, into a single remux mode mkv file or does remux always produce the sub and idx files?[/QUOTE]
Remux is a process of re-multiplexing (re-packing) the content from one container into another one, without any modifications to the coded stream. That's why nothing could be rendered into the video stream - there's no rendering process involved.
As it stands now, DVDFab yields subs only in idx/sub format, and you need third party soft (e.g. SubtitleWorkshop to convert it into MKV-friendly format and mux it in with something like mkvmerge). It will take minutes.... DVDFab however, will be handling subs differently... soon, according to developers.