Hi, Tony! Thank you for answer.
By the way, even in current version you can use multiple floppies with one trick, simply add into config such kind of a string:
boot /SD_PATH/BOOTABLE_DOS.img /SD_PATH/SOME_DISK_1.img /SD_PATH/SOME_DISK_2.img /SD_PATH/SOME_DISK_3.img
Works great in Magic DOSBox and you can switch between disks simply through the main menu 😉