I read your example threads and here's my response:
First thread was posted in Oct 8, 2008 so it's basically irrelevant now. Anyway to answer the guy's question: Set up proxies to "_M" and set timeline to dynamic quality. Make sure to also set video processing to high precision YUV to see the clips in best quality within FCP.
Second thread "_M proxy files but when I try I always get the red render line and have to render before playback"
This guy obviously has no idea how to setup his sequence in FCP, which leads me to believe he doesn't understand what the log and transfer in FCP does to R3D files. There's a variety of different ways to use Log and Transfer, but in general, most of them aren't great. I don't feel like getting into details about it right now though.
The third thread is from Feb 20, 2008 so basically the answer is the same as the answer for thread 1.
The fourth thread is from a guy who doesn't know RED post either. Check out one of the other threads he started:
http://forums.creativecow.net/readpost/223/8209
"Suggestions on removal of Heavy Blue Color cast"? Really?
Motion Design, Color, Editing
Simulated Wood Grain Cabinet Inc.
Bunim-Murray Productions