You say: Added subtitle options (size, color, border)
The new subtitle options are available in the subtitle section of the Playback menu.
The Playback menu can be accessed by holding the center (select) button while playing a video in Media Player.
I can access the playback menu and I can choose the right chapter, audio and subs there, but I cannot see any subtitle options for size, color or border. Am I missing something? I use latest jailbrake and mp 0.71 and latest maintenance