Do they still make rear shocks with remote flow control valves?
The shock you are referring to was marketed as a 'brain' shock I think. The worked by varying the damping based on detected rear wheel movement. As far as I remember only specialized sold them, first produced for them by Fox and then an in house model. They typically appeared on more XC orientated designs and I've never seen one available as a separate retail product.

Fox have been working on a very similar concept using electronics instead of a remote 'brain' to vary the damping. See http://www.pinkbike.com/news/exclusive-ride-report-fox-live-valve-active-suspension-system.html for more info.