With this mod microSD card will appear as primart storage (/storage/sdcard0 and /mnt/sdcard) and internal SD memory will appear as secondary storage (/storage/sdcard1 and /mnt/extSdCard).
Technically this mod updates file /system/etc/vold.fstab
Mod is flashable via recovery and is meant only for Cyanogenmod 10/10.1 (Jelly Bean).
Always make full Nandroid backup before flashing this mod!
Disclaimer: I am not responsible for anything that may happen as a result of using this mod.
I didn't find GUI option for this, so I created this mod.
P.S. If there is a GUI option or other similar mods, please post about them in this thread.