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Honestly? Never touch a running system, especially not with non verified stuff.

IMHO wear levelling on an OS drive is completely overrated. The OS itself can't possibly write that much to the drive that it wears of after a short period of time.

I'd stay away from it.
 
You might get better answers to these questions in the OSX forum as you're really diving into the details of the file system.

I don't know much about how the journaled file system works, but would agree it's not worth messing with. Unless you are using your SSD to store a large high load transactional database, you can pretty much rest assured that your SSD will outlast your system when it comes to wear from writing to the NAND.
 
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