Correlations not only for "search engine" but separately for organic and for paid search engines would be nice!
Example: It would be possible to correlate pages with org. search engines.
This would be helpful to analyze organic traffic over a specific date range.
Don't you need this too?
Check out https://github.com/msukmanowsky/omniture-trafficorganizer/wiki/_pages I think you'll find that it solves a lot of what you're looking for.