For the next DeEd ROTJ 2.0, I believe Harmy will be using film print references for both the appearance and timing of the alien subtitles (I used the same reference for timing for Project Threepio 9.0). For 1.x and the workprint, he kinda matched the film print appearance (close font match), but used DVD timing and a non-theatrical fade-in/out effect. The official releases use subtitle image overlays (not burned-in) on the disc, which look nothing like theatrical, either in appearance or timing. Player-generated subtitles are extremely rare, almost all discs just use graphical overlays.