Hello Mio,
This is currently not possible. You do have a good point though and changes have been made for the next version.
When the next version is released, and you have updated. To send them directly to Create Ticket, you will need to have Settings ->Brands->YourBrand->PortalOptions tab -> "Display option to send ticket list by email in portal" and "Enable login form" unchecked.
Cheers,