I like the idea of the Geneva Convention (no pillaging, no taking civilians (workers/great people/missionaries, etc.)) as a late game addition to the world congress. Though you'd have to have some way from stopping players from simply making civilian shields around their cities.
I don't know about automating archaeologists - IMHO that's close to automating combat, as it's pretty key to the cultural victory (and if you aren't doing CV, you don't really need to worry about the ones outside your borders). OTOH, given the current pathfinding, etc., automated archaeologists would likely be so bad, you'd have to do them manually to get any major advantage.
They really need to fix the pathfinding though. Sending an archaeologist to a site ten turns away, only to have them stop after 4 turns because the tile is blocked now, is very annoying. Especially trying to figure out where they were going because they don't say where their previous destination was.