Hi ,
Currently we have auth/authz via TACACS+/RADIUS support for WCS:
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a0080851f7c.shtml#intro
http://www.cisco.com/en/US/customer/docs/wireless/wcs/7.0/configuration/guide/7_0admin.html#wp1064100
However admin user activity cannot be tracked and there is no TACACS accounting support on WCS yet.
An enhancement request was raised for this, but seems like this feature has been postponed.
You may want to track this enchacement request further with your local Cisco rep or account team:
CSCta98733 Need TACACS accounting support on WCS
HTH,
Alex