+1 for folder mount, it's a life saver if you have a lot of huge apps. Saying that can't the S5 move apps to SD natively? There is an option at times to move to SD? There was a script a while ago which was called ext2internal it was made for the S3 and literally swapped the memories around. Could try contacting the creator but unless he has an S5 i highly doubt he will do it.
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