meegja on "Exclude certain images/thumbs from rotating on frontpage"

Is it possible to exclude certain images/thumbs from the rotating of random images on the frontpage and in subfolders? I can set the main thumb for subfolders but I can not find a way to set the main image for the frontpage and galleries itself.
I have some nude 3D renders and although over here (The Netherlands) people do not care, in other countries they don't like it to be confronted to nudity without any warning.
I use the default Effervescence+ as theme.