audio|acacia does not currently support control of the Russound CAA, CAV, or CAM amplifiers and in-wall keypad controllers. Perhaps if there are enough requests from users, this feature could be added.
However, there is nothing precluding you from using your CAM6.6 as a basic multi-channel amplifier. Setup would be pretty simple. Using the outputs on sound cards a computer running the audio|acacia Back-End Server software, you could create up to 6 rooms/zones that you then feed into the CAM6.6 source inputs, one source input directly corresponding to one room/zone. Then you let audio|acacia handle the switching of sources and the audio synchronization.