The answer is YES, except the AP76xx series APs. All other AP models supported under latest WiNG 5 release has support for KeyGuard.
KeyGuard, Symbol's/Motorola Solutions/Zebra Technologies/Extreme Networks proprietary TKIP encryption implementation is based on the 802.11i standard. It is the seamless, dynamic, and per-packet rotation of WEP keys between a Symbol's/Motorola Solutions/Zebra Technologies/Extreme Networks Access Point and a Symbol's/Motorola Solutions/Zebra Technologies 802.11b Mobile Unit (MU/Wireless Client).
40bit or 128bit encryption needs to be enabled on the AP and MU for KeyGuard to be used.
This solution/feature is only supported with WiNG 4 or WiNG 5 with legacy Symbol's/Motorola Solutions/Zebra Technologies Mobile Units (MU/Wireless Clients) that have this built-in support.
Most devices today support WPA/WPA2 encryption and no need for KeyGuard. This feature can be configured under the CLI (Command Line Interface) and/or the UI under WLAN settings.