USB Mass Storage locations to mount?

I'm working on a tablet for a friend, running Android 4.1.1, just got it rooted, Link2SD running, SD card properly partitioned. Everything is good... except before installing Link2SD and partitioning the card, when I would connect the tablet to my PC by USB, and turn on USB Storage on the tablet, my PC would mount the tablet's internal storage from /mnt/sdcard and the tablet's micro SD from /storage/sdcard0 ... now that I'm using Link2SD when I enable USB Storage, it mounts /storage/sdcard0 and the ext2 partition of the micro SD card created for Link2SD. Any idea why this is and how to correct it? I'm hoping there's a system setting somewhere that I can list which locations to share when turning on USB Storage mode on the tablet.