SD Card permissions trouble

This thing has been a thorn in modding my phone ever since I rooted it - root has no read access to sdcard0 at all.

Whenever the external sdcard is mounted, root can only access sdcard1 after adding media_rw group to android.permission.WRITE_EXTERNAL_STORAGE, which works OK most of the times but there are some apps that rely on working with an external sdcard and root together unfortunately. Whenever the external sdcard is unmounted, same things happen with it - no access as root whatsoever. (user has full access)

Something of particular interest is the output of ls -l:

Code:

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shell@Mika_M3:/storage $ ls -l
drwxrwx--x root    sdcard_r          1970-01-01 01:00 sdcard0
drwxrwx--x root    sdcard_r          2015-08-10 02:48 sdcard1
shell@Mika_M3:/storage $ su
root@Mika_M3:/storage # ls -l
drwx------ root    root              2015-08-10 02:47 sdcard0
drwxrwx--x root    sdcard_r          2015-08-10 02:48 sdcard1
root@Mika_M3:/storage #

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and I don't really know where to begin to fix it. The stock ROM is doomed from the start with this it seems...

For the record; I'm using SuperSU and I have tried formatting my (2GB) sdcard to FAT32 and it didn't work.