The shift + E option was blocked on purpose on this aircraft to allow the simulation of the pressurization system.
The doors can be opened by using hidden clickspots on the door annunciator lights. You can access them by either shift +9 or on the engineers overhead panel. Just click the annunciator and the corresponding door (front, rear, front cargo or rear cargo) should open.
The flight decks right window can be opened with a clickspot on the main panel.
Those functions can't be assigned on the joystick. You need to DISABLE it when using the TU154 (control + k) and make the assigments using the utility as described in the manual. (you'll just need to do it once, of course)
תודה מיכאל,
כל הכבוד על המדריך המקצועי שכתבתם, קריא, נוח ויעיל