One minor point (Score 1)

In my opinion, I think it will be better to make "Not willing to Moderate" the default. If someone who does not have the energy or willingness to change a simple preferences option will probably not have the energy to actually do any moderation. Being a moderator is all well and good, but if you never use the power it is pretty pointless. If you have to set "Willing to Moderate," it is much much more likely you want to moderate, and will do so.

Although I am slightly worried about moderation as a whole (I always worry about systems which have the potential to silence people) I agree that some sort of moderation is needed. I think Rob is doing the right thing overall, and I will reserve judgement about specific plans until I see them work (or fail to work).

--Nick