Sql-server – can I add a custom SSRS e-mail subscription that forces the “TO” address

I would like to know if it is possible to add a custom delivery extension(?) in SSRS that will enable me to force a value into the "TO" address for particular subscriptions?

Big picture: I am exploring ways to schedule reports that would only permit them to be sent to a specific email address.

EDIT: Somewhat related, I would also like to know if I can create a second e-mail delivery extension without having do any programming. i.e. I would copy the extension details from RSReportServer.config for the "Report Server Email", give it a new name, and change a single configuration value.

SECOND EDIT: In the hopes of getting some additional input and ideas, the big BIG picture is I want to create a method to create an SSRS subscription that would guarantee the recipient is a particular e-mail address. This method should be usable by all users, but even knowing how to let one user might be workable. Subscriptions to other e-mail addresses must still be permitted.