My disant landscapes are constantly plagued by small, flickering black textures around the edges of distand rocks, buildings, etc. It's not constand, and only flickers when I'm moving, so I'm wondering, is this commonplace? And is anybody working on a mod to fix this?

I don't know the answer, sorry. Yesterday, there were so many posts somewhat similar to yours that I became frustrated and skipped past any that didn't include the regular stuff automatically. You didn't do so, either. You have a graphic problem, in spite of which, you have chosen not to name your video graphics adapter's name, not the number and date of the video driver you are using with it, nor even the Windows version, with service pack level, that you use. See what I mean? There is just too little to deal with here. Again, sorry, but I would like to help, you just won't let me do so.