Answer One: yes you can forward from distribution list or in your term "folder".
Answer Two: You need a third party program. The "forward" really works like a "copy", so whatever gets in one mailbox gets "copied" to another mailbox. In terms of "customized mailbox for internet smtp, it will be routed outbound by the IMS. So, to forward only the mail with the "To" field you need a third party program such as GFI Mail Essential to sort them thru.