About Other methods
Other Fegg\Application methods you can call with $this->... in a controller.
Config
Load config files from site/config/ and read the settings.
Ticket
A ticket protects form processing. setTicket() creates a random string, stores it in the session and adds it to the form as a hidden field (output with {{ hidden }}). When the form is posted, useTicket() checks that the posted value matches the session and then removes it, so the same form cannot be processed twice.
Redirect
redirect() ends the response by throwing Fegg\Http\Halt, like displayPage(). Never write exit in a controller; use $this->halt() (see Ending a response).