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@ all:

The combination RST RAID ROM v11.5.0.1207 + RST(e) Drivers v11.5.0.1207 obviously lets the TRIM command pass through the Intel RAID Controller to the RAID member SSD's even under Windows 7.

This is the result of tests done by a German user named btester and layed down and documented by screenshots >here<.
Here is a translation of his text:

Originally Posted by btester

I have tested this new Intel RAID ROM for SATA - v11.5.0.1414 + RST 11.5.0.1207 with my Z77X-UD5H under WIN7-64bit with 2 SSD's as RAID0. After having deleted the data the related sectors are empty again (showing just zeros).
As long as I used older RST drivers and ROM versions I got these sectors with the deleted data completely full with YYYYYYY, now - with the actual v11.5 Drivers/ROM combination - I only see 0000000, that means the cells have been cleaned by TRIM.
The same thing happens with a single SSD running in AHCI mode after having done a quick formatting.
According to my knowledge TRIM is working now within an RAID0 array of SSD's.