On the question: " How do you shoot low light?" I would respond with: standing next to my K20D, which is on the tripod, having my wireless/cable trigger in my left/right hand. Thinking why is my bag so heavy!
Actually I tend to stay in M mode, sometimes with the help of the Green Button, sometimes just by experimentation (if the time allows it).
I shoot 99.99% in RAW, WB if it`s not on Shade than it`s on Flash. I tend to forget that I have set a week/2/3 ago flash for WB.
I like to keep ISO as low as it can possibly stay, rarely jump over 800/1600 (100/200 if I have flash with me and is allowed to be used), but again I am no commercial shooter, no worry if thing don't come out exactly I wanted to/needed to.