Like Rat5 said Boeings philosophy is manual flight = no A/P no A/T.
Regarding the W.E.P in manual flight; if you are flying single channel and hit TOGA the A/P kicks out reverting you to manual flight with A/T engaged this would be contradicting their philosophy about manual flight.
Automatic flight or Dual Channel: by pressing TOGA will allow a full automated GA, but like a previous poster said ' be prepared to go manual flight and don't rely solely on the automatics'.