I'm not seeing any way of doing that. We can add "Custom Fields", but these are limited to Color Combo List, combobox, Currency, Date, DateTime,Hyperlink (Tried this and added users email address into the "Info" section, but this did nothing), MultiSelect, Numeric, Radiobutton List, Textarea, Textbox, Time, Yes/No. There is no "CC" or "Email To" or anything like that in this area.