UESP isn't going to like it much if people start trying to populate those. They've raised stinks before when people have tried to put mod specific info there.
There are pages for mods over at the Oblivion Mods Wiki (if it's still up) but nothing that would cover the same kind of detail that the UESP goes into.
A wiki site dedicated to that kind of mod info would be nice to have, even though I really don't much care for wikis
