Jesus was capable of desiring anything. He chose not to desire some things. "Father take this cup from me. (an inner desire). Yet not my will but thine be done (an inner desire.)" In this passage Jesus desired BOTH sides of a decision about the cross. He freely chose to do the Father's will.
Since Jesus understands REAL FREE WILL, and since "all things were made by Him and without Him was not anything made that was made," and since He is the 2nd Person of the Trinity, and He is all-Powerful, therefore, be it affirmed that God is POWERFUL ENOUGH to make it so that mankind has real free will, to include the capability to "want" both sides of any issue.