  The precise manipulation of transverse magnetic domain walls in
finite/infinite nanowires with artificial defects under the influence of very
short spin-polarized current pulses is investigated. We show that for a
classical $3d$ ferromagnet material like Nickel, the exact positioning of the
domain walls at room temperature is possible only for pulses with very short
rise and fall time that move the domain wall reliably to nearest neighboring
pinning position. The influence of the shape of the current pulse and of the
transient effects on the phase diagram current-pulse length are discussed. We
show that large transient effects appear even when $\alpha$=$\beta$, below a
critical value, due to the domain wall distortion caused by the current pulse
shape and the presence of the notches. The transient effects can oppose or
amplify the spin-transfer torque (STT), depending on the ratio $\beta/\alpha$.
This enlarges the physical comprehension of the DW motion under STT and opens
the route to the DW displacement in both directions with unipolar currents.
