It would be really a nice feature if one could build up a local Movie database on the HD, that means to access a movie by activating the .bsi file on the HD - then bsplayer asks for the CD (or at least a CD that contains a file with the specified name / could also be done by the CD id) and for the next one, when the the first one has finished (what will probably mean to extend the .bsi specification but that should be possible... ;-)
This way you could handle multiple disks via one locally stored .bsi file (good if you have lots of older movies that you want to take prfit from the bsplayer abilities without reburning each and every movie, or to extend your movie (this is, if you got more ore newer subtiles audio streams etc.)
2. Different Handling of Play/Pause Button.
It could be enough to have only one button for Play/Pause (you wont need to play while playing or to pause to pausing) like the QuicktimePlayer eg. works (you either don't need three feet to drive a car / for US guys: there are also real cars with more than two pedals... ;-))
although this isn't really nessessary, i think it could improve look&feel (at least a bit - apple does so, ms does so, both pay a lot of money for interface production - so it can't be that bad (well it could, if apple wouldn't... ;-) ... please do not flame ;-)))