What device type / brand are you looking for? If it's a brand that's not listed in the supported device guide - then AirWave would only provide some monitoring support and that's only if the device responds to the generically mapped MIB II OIDs. If you've tried adding as generic 'universal network device' and see something missing, then it's the opportunity to file a feature request to add support for that brand.
Brands that actually make the list have a mapping to their MIBs which allows additional monitoring / mgmt capabilities.