You don't need a mod. What you want to do is copy the Registered group and call the new usergroup something like "Registered and Can Post". Give the new group all the same forum and usegroup permissions that you currently have given your Registered group. Then, create a Promotion to move the users from the Registered group to the Registered and Can Post group after 3 days. Run the Promotions Scheduled Task and it should move a bunch of users into the new group. Now that you have the new group 'filled', you can go back to the Registered group and remove their permissions to post threads and replies.
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