Users submit a cck field value on page?

Hi, I'm looking to add a form input field to my node.tpl so users can enter a value and submit to a CCK field to store the value.

I've found this snippet for users to free tag a node with a vocabulary:
http://drupalsnippets.com/snippet/type/php/allow-users-free-tag-content
I wonder if it can be modified to use a CCK field instead?

Also, like Wikipedia, anyone can save a new value. So I would setup an email notification to the site admin to check the value and if the new value is correct, leave it, else delete it and revert to the last verified value.

So I imagen a textarea CCK field with comma separated data for each users submission. (I won't use commas to explode() the fields value, rather '|' because I know the user won't use this character).

Any help is much appreciated!
Marc