I can only assume that CSMT will further improve the Steam engine performance.
I do plan to test CSMT with wine as soon as I have some free time. I've got an on-going X3:TC game that I cannot convert to the native Linux version due to excessive customization that for the life of me I cannot reproduce (Oh, the irony!). Being severely CPU bottle-necked (The X engine is single threaded) CSMT might actually be a life-saver. (At least until I finally give up and switch to the native Linux version of X3:TC/AP...)
Thanks for the SteamPipe head's up. I'll give it a test.