Yes, you can enable this in the image verification settings.

Yes, you can set the SEO name in the Helpdesk Addon settings.

No, anonymous or unregistered customers do not need to be signed in to submit a ticket, however for security reasons when a customer submits a ticket for the first time they are sent an auto-generated username/password to log into the system. If a customers email already exists in the system they are directed to... more

Yes, the file attachment icon is located at the bottom of the message input field to the left of the "submit ticket" buttons.  more