Internet Sharing and WPA?

Under 10.6.5 when I enable Internet Sharing to allow my devices (iPod and Sony BD Player) to share my iMac's ethernet connection via AirPort, I only see WEP in the security protocols. Is there a way to enable WPA2 Personal for Internet Sharing or am I stuck with WEP only?

I have got my answer for now... as I now know, it is WEP-only. Let's hope 10.7 introduces some better security for shared connections. I have sent in a Feedback to Apple with that suggestion.