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I have done one website in Magento. the website url is http://rnjpillows.com.au. In that website I want the user to tick the checkbox in shipping method if they want Traceable or registered is requested along with the table rates. Additional $4 is added to place order overview page if the user ticks it.
Please checkout our Magento Extra Fee Extension
This extension will allow you to create shipping type extra fee either mandatory or optional, which will be listed in shipping method are on frontend. If fee is optional then checkbox is shown for customer to select & if customer selects the checkbox that extra charge will be added to shipping. I hope this what you are looking for.