What a great news ! there will be three important improvement in the next CyanogenMod 7 RC13 for Milestone A853, The Crystal Talk (built-in functions) , the Gingerbread Android 2.3.5 memory fixes, the DSI fix v2.x . The update package is going to release later today or tomorrow, I am looking forward to this RC 13 update. Nadlabak said there will be more than one RC13 update roms, because the DSI-fix needs some more debug.
If you looking for Crystal Talk patch for CM7 for Milestone RC10+, you can visit this article about adding Crystal Talk to CM 7.
More information about the Gingerbread Android 2.3.5 update, memory leak with the surface part.