I've just had my first successful 802.1X wireless login window authentication on 10.7.x.
My .mobileconfig consisted of adding a certificate payload, and a network payload. The certificate is literally a drag and drop event. The network configuration for my wireless consisted of entering the SSID, WPA2 Enterprise, TTLS & PEAP protocols and selected MSCHAPv2 for inner authentication.
Turns out there are no utilities, other than manually editing your .mobileconfig file, that will get login window 802.1X authentication working.
After using Profile Manager to output a user profile I then added the following to the .mobileconfig;
Starting the line immediately below the SSID_STR key's "<string>" value add;
<key>PayloadScope</key>
<array>
<string>System</string>
</array>
And this line immediately above the bottom most PayloadType key;
<key>PayloadScope</key>
<string>System</string>
And for the login window profile;
<key>SetupModes</key>
<array>
<string>Loginwindow</string>
</array>
Hope this helps someone.