Make Wordpress force opt-in to be allowed to register - Plugin or Mod?

I'm trying to find a simple way to have wordpress users forced to join my opt in page if they want to register for my WordPress site. Been searching but not finding anything relevant.

Right now I use S2member for membership management and it's only an option on the register page for getting my mailings. They can uncheck it if they like. I'm using mailchimp API with S2member in wordpress. Free registration is enabled.

I would like it that before they can register they must opt-in to my mailchimp list. Rather than have it as an option on the register page.
Even better, if they unsubscribe from the list, they should lose their WP account login access but the account should not be deleted.

Is there a a plugin, paid or otherwise, that will do this exactly?
Am I left having one written or moding code?
What are the options?
Anyone else doing this?
Is it against some TOS that I have not noticed?

why don't you force them to check the opt in box while registration
you can code javascript for that like we check blank fields
i guess that would be pretty easy

pavan said:

why don't you force them to check the opt in box while registration
you can code javascript for that like we check blank fields
i guess that would be pretty easy

Click to expand...

Thanks for the suggestion.
No doubt there are tonnes of mods I could do here to make that work.
I was wondering if anyone has a canned solution. I don't want to jump into modding and writing code if there is even a free plugin or something. I'm a decent PHP guy but not willing to spend the time on something like that if I don't have to. It's not a big issue but I want to squeeze them for the privileged content. Any fool will uncheck the opt-in link if he can get free stuff.

Seems that there might be an S2member hack for this.
http://www.primothemes.com/forums/viewtopic.php?f=4&t=6408#p15725