Sure, just use
AIS_StatusOfPick AIS_InteractiveContext::Select(const Standard_Integer XPMin, const Standard_Integer YPMin, const Standard_Integer XPMax, const Standard_Integer YPMax, const Handle(V3d_View)&aView, const Standard_Boolean updateviewer=Standard_True)
(XPMin, YPMin) -> (XPMax, YPMax) define your area.