Removing a post from a single channel is pretty complicated. It's kinda loopy to use the nochannel command and then re-add all the other channels just to get rid of one channel. Would it be possible to have a *notchannel command? It would be nice to be able to say *notscience, for example, and then have that one channel removed from a post. It would also be nice to have a "Remove post from channel" for the channel owner by each post.