Well, I'll go check my installation to see why static-pages isn't an option. Maybe I installed it without restarting the server, but I don't believe that this is the case.
However, Dave's answer tells me that static-pages isn't what I'm looking for anyway. I would like to find a way to add comments to ADP pages in the /www directory. Is there any easy way to do this? If not, then I can probably use the news module for this purpose, which I know supports commenting. (I didn't use news from the beginning because I figured that it would be easier to add comments to static pages. Foolish me!)