There needs to be a way to exempt certain URLs from Safe Search. For example, Google Earth uses www.google.com/earth to for its location searches. However, when Safe Search is enabled, all searches using www.google.com include the Safe Search string, but Google Earth does not use/support Safe Search, so the query fails. It is possible to exempt domains from SSL Inspection, and thus Safe Search, but in this case, it would mean exempting www.google.com which is not acceptible.
Also, it would be nice if the Safe Search feature were configurable. Right now, if it is turned on, users automatically get "strict" filtering. There should be a way to set the level of filtering on a per rule basis.