the only things not working on all cams are:
- video quality setting (for example on s5is, missing some asm code in movie_rec.c, one or two other cams along those lines), this includes the video overrides & video remaining time etc, as they rely on movie_rec.c (more or less).
- video pause/unpause does not work on all cameras (btw the stop command should work on all of them, available via script)
on some cameras some usb detection code isnt properly done yet
other than that i cant think of anything right now