Atemi Waza/Pressure points
Sorry. This thing didn't work right.
Pictures of O'Sensei demonstrate him delivering atemi to pressure or vital points all of the time-see Budo in particular.
Although some disagree with me, striking pressure points can be accomplished with the flowing movements without disrupting the technique. Dillman's books are a good place to start with learning the function of some of the pressure points (release the wrist with triple warmer 3 for example works nicely with kotegaeshi). If you want to study, look for a source book and then when practicing techniques look for ways to strike that flow with the natural movements of the technique.
My opinion is that the transition from art to street technique is atemi waza to pressure points. This allows the principles of aikido to be maintained while aiding in the technique set up.