Sorry, if I am wrong here, not exactly sure where to post this.
I think it would be very usefull if you would add an option where people can decide if they always want to start with disk 1 or with this one which they played the last time.
So if you are playing a multidisk game and complete disk 1, it’s a bit annoying always to start with disk 1 if you open the game. It would be nice if Retroarch could remember which disk in this m3u playlist has been played the last time and automatically swaps to the right disk if you start a game.