automatic role promotion based on specific node / content type contribution

Hi,

I was wondering if there is a module around that what allow for this:

An authenticated member contributes a specific page (node) of a specific Content Type to a site. Once this page has been added the users role will automatically change to a "higher" level allowing access to a particular content.

Basically this would reward a user for entering information to a specific topic. By adding this information, the user becomes part of the group (circle) of people contributing to this specific area.

In some ways this is similar to a poll. There you enter your vote / choices and then the result is revealed. But I need several CCK fields to be completed.

Thanks for any hints about this.

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Edited by silverwing - moved to post installation forum