Has anyone tried the mod cleric domains in the editors section? I would like to give them a try, but could not get them to open. Its looking for a BG file.

I imagine you need to run it in the game's installation directory...

Yes, I tried it a very long time ago so I can't remember exactly what I did, but Taluntain's idea sounds good. I don't remember them being anything special, but I know for a fact they're easy to uninstall, so experiment all you like :)