Subtitle Positioning/Method for Blu-ray

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How do you think studios should position subtitles on Blu-ray titles and using what method?

Do you think the consumer should be given the ability to select the subtitle positioning?

Do you think subtitles should be bitmap based or scalable/vector graphic based text subtitles, or do you think either of the two options should be selectable as options?

Which method do you think would look best on the Phillips '21:9' or '2.39:1' HDTV which has a resolution of 2560 x 1080, or other higher than 1920x1080 resolution displays which are likely to appear in future? Scalable or current bitmap based subtitles?

Do you think scalable text based subtitles provide other benefits over current bitmap based ones, for example in amount of disc space used?