Pre-shared key identity is a mandatory field whose value is not immediately apparent to newcomers. The description "Enter a non-secret pre-shared key identity string." doesn't answer why it's needed or how it's used. Host Wizard should:

• Provide a good default value, e.g. Host name + " PSK"
• Better explain the meaning, e.g. "Enter a unique name by which this PSK is known to Zabbix components"