It appears that the NM-CIDS is supported.
This was in the documentation on CCO:
http://www.cisco.com/en/US/partner/products/ps6241/products_configuration_example09186a008067a2b0.shtml#wp15514
If the link doesn't work do a search on
Configuring Distributed Threat Mitigation in Cisco Security MARS.
Hardware and Software Requirements
Static IPS Devices
Cisco IPS 4200 Series appliances using Cisco IPS Sensor Software v5.1.1 or greater
Cisco ASA 5500 Series appliances with the Advanced Inspection and Protection module using Cisco ASA Software v5.0 or greater
Cisco IDSM-2 sensor blades for the Cisco Catalyst 6500 Series using Cisco IPS Sensor Software v5.1.1 or greater
Cisco NM-CIDS Network Module (with Cisco IPS Sensor Software v5.1.1 or greater) for Cisco 2600XM, 2800, 3700, and 3800 series routers
Hope this helps.