If you desire to keep your TRW shares in certificate form then that certainly is your prerogative.
Once shares are registered and publicly traded there is nothing that the company can do to prevent shareholders from having them deposited into their respective brokerage accounts. Technically,the TA would automatically transfer the shares to those accounts unless instructed to issue them in cert form by the shareholder.
The downside to keeping them in cert form is that in order for you to sell you'd have to locate a buyer; something that the exchange would handle for you, otherwise.