I don't see any permissions needed for posting OMOD scripts and BCFs, as long as you aren't including the original files with it. After all, they're both just forms of meta-data.
As a matter of fact, BCFs were coded deliberately to not need permissions. They don't contain any of the author's files (unless the BCF was poorly made), require that you download the author's files yourself, etc. All a BCF boils down to is a list of instructions of how to move the files around, and any files that you added yourself.
OTOH, it would be decent manners to attempt a quick PM or email just to let them know about it.