Subtitles background window

This has probably been asked already, still is there any reason why the subtitles do not have any background window option? I mean the half transparent rectangle behind the subtitles. I don’t believe it would be so hard to implement them, I can configure those in any other video player I use. Changing the subs colour isn’t enough, I personally like them white and when there are some other texts in the video the subs become unreadable.

Also it would help if, when pausing, the subs would go above the tracking bar. Any chance to see these added?