We implemented at least two of these suggestions in SiteCatalyst 15. Specifically, you can segment by your marketing channels, then run a pathing report to create the link that you suggested in the third bullet point, and Visits is available as a default metric.

This has been *partially* implemented in SiteCatalyst 15. You can now add Instances and Unique Visitors on the Referrers and Referrer Types reports.

This has been implemented in SiteCatalyst 15, via segmentation. You can apply a segment to an entire dashboard, or to individual reportlets.

Thank you for your input here.

Thank you for your input on this.

Thank you for your input on this.

This has been implemented in SiteCatalyst 15. Visits and Visitors are de-duplicated for classifications. This is great because you don't need to rely on eVars or props as much, when you're looking for a Visit or Visitor total for a group.

This is implemented in SiteCatalyst 15, which offers a new "Unique Visitors" metric in the overwhelming majority of reports. This is true Unique Visitors for any date range that you select.

This is implemented in the form of List Variables in SiteCatalyst 15.