A broken CSMI pass-through support would not only affect third-party products. It likely would also break pass-through related functionality of Intel SSD Toolbox (as reported here for RSTe 3.1.0.1068). This leads to the following new version of my second question :-)
Do SMART, SSD optimizer and firmware update functions of Intel SSD Toolbox work properly for Intel SSDs behind IRST 11.2.0.1006 and/or 11.5.0.1207 ?