As long as you have Windows TRIM function, you won't need rapid.
I'm not sure what you mean by this. As far as I understand TRIM and RAPID are totally different technologies. TRIM is for identifying and balancing the use of operational sectors on the drive. RAPID is a drive caching technology that uses RAM to temporarily house data and improve performance.
(Just as a reminder I am talking about Samsung Magician RAPID mode, not another brand's technology of a similar name)
If anyone has any ideas on how to get RAPID and the Live File System to play nice I'd love to hear it.