Active carrier shipping flags seem to be recognized by Magento outside of just my module.  Fascinated.
Migrating ShippingMethod to Abstract,UPS,USPS inheritance tree to handle multiple carriers.
Bug fix: should look up service_code, not serviceCode
Have a simple controller action running.
No real progress.
Successfully overloaded extension controller method\!
Committing before removal.
Breaking mass action work into separate module.
Attempting to add a column to the orders grid by cargo culting the Fooman Ordermanager extension but no luck.
Ah ha, getting column to show up now.
Cleaning up a bit.
Retrieving rates for sales order grid.  Some repetition eliminated through rocketshipit helper.
Order override dropdown now rendering.
Refactored carrier abstract to use helper for simple rates.
Cleaning up carrier abstract.
Rocketshipit observer now respects the shipping code attached to an order.
Working to get grid column to actually POST to the server.
Shipping override is working.