Took me a while, but I’m now rather confident that the issues I was having with the MR3020 as a mjpg-streamer powered streaming webcam server are related to the camera(s) used, not (only) to the tiny box. As you can see below, “only” in daylight the images gets distorted:
As of now I assume that the framerate reported by the camera is responsible for this, as that cam is reporting only 30 fps for all resolutions. It’s working nicely on a SheevaPlug with full-blown Debian, but Sheeva is a different hardware to the MR3020 (and 3 to 5 times as expensive per box); I might try a Dockstar as the host for this cam, but time will tell.
Just FTR, with a quickly ordered Logitech C270 HD, the MR320 is serving just nicely as a streaming webcam server (cam reports 5 and 10 fps for 1280×720, I choose 5, which is sufficient for now):