I found afc2add pretty buggy at the moment, so i created small and dummyproof alternative guide to access root filesystem via iFunBox on iOS 7.
Download iFile
Go to Home, Media
Then Tap edit
Tap the + icon
Next, change type to Symbolic link, go back
Set link target to /
Name it ROOT
Done
Now everytime you want to go to root, just open the ROOT folder you see in iFunBox after connecting your iPad
Download iFile
Go to Home, Media
Then Tap edit
Tap the + icon
Next, change type to Symbolic link, go back
Set link target to /
Name it ROOT
Done

Now everytime you want to go to root, just open the ROOT folder you see in iFunBox after connecting your iPad