Allow anonymous to submit ticket (the way anonymous would submit comment)

I would like to use "Support" as a normal contact us form, therefore, user don't have to register to submit "support". I previously did this with "inline registration" module, still it's troublesome where user is required to fill up username. Now, giving anonymous user permission to create "support",

I was thinking of using cck fields for "support-ticket". But I need to get user's default values (incase they already login) from Profiles/content profile. There's CCK hook_default_value http://drupal.org/node/371502 but not really helpful.

On the default value "PHP code" it stated To figure out the expected format, you can use the devel load tab provided by devel module on a support_ticket content page. but not so sure ..

thank you ..