Will the pushback truck be able to pull the plane forward and turn at the same time like they do in reality when the get too close, such as a plane or building. If it has this still keep the normal pushback and turn as well.
The pushback truck will always use the best possible turn/pull combination to get you out of the parking.
Avoidance of other vehicles it's entirely different issue, and avoidance of scenery object is not planned at least for the initial release. However, since the pushback truck will always push along apron lines, it's highly unlikely it would run into a scenery object.