In a site with multiple currencies available for purchasing, we are already passing this value (currencyCode), and should be able to access it in some kind of report, even if it is only Discover or Data Warehouse.

Searches is a good metric for Search Engines, but just as important is actual Visits. User behavior may be that guests enter by search, use the back button to go back to a search engine, refine their search and re-enter the site. This (correctly) shows up as 2 searches, but should only be a single Visit, to allow for an easy look at share of traffic coming from search engines.