[development] cck filefield related question

[luca capra]

Hi,

probably I'm in the wrong place but I try to ask..

I'm using hook_form_alter to present a special form to anonymous users 
in D6.

I got unlimited upload for a cck image field, but I would to limit to 1 
for unauthenticated user.

I've found this un-answered question in the cck issue queue:
http://drupal.org/node/530828#comment-2288010

Should I maybe play with the submit hook?

Thanks in advice,
Luca