Hi pemasirid,
The following are all the attributes that the ASA accepts for VPN connections, including AnyConnect:
http://www.cisco.com/en/US/docs/security/asa/asa83/configuration/guide/ref_extserver.html#wp1605508
In terms of where to configure them in ACS, you would add them into the appropriate Authorization Profile that you are returning to your VPN clients. Go to Policy Elements > Authorization and Permissions > Network Access > Authorization Profiles, and create one (or edit one you already have). Go to the tab called Radius Attributes and pick the dictionary type "Radius-Cisco VPN 3000/ASA/PIX 7.x", and those attributes from the link above should be there to choose and you can enter your values.
Then assign that Authorization Profile to your Access Policy rule that is being matched for your connections.
Thanks,
Nate