I tend to be a very literal thinker as well, and enjoy the process of organizing and setting up some sort of plan for what I am going to practice. It is important to realize that no time on the instrument is wasted, and honestly as long as you are playing and loving what you are doing; you will progress in some way so don't get too caught up in worrying about what your not doing.

I agree with John, as it is always best to practice what will be applicable in your musical life. Working on songs you enjoy incorporates so many different elements of real world playing, and I often will use a song as a catalyst (better put, an excuse) to practice something.

Perhaps to better combine your need for a more structured routine with your desire to rock; you can take a song at a time and use that as a way to get better at some sort of technique within that song. Use "Breaking the Law" as a way to work on your right hand technique, and than move on to another song that you enjoy to incorporate a new weakness in your playing. I often use this approach and if done wisely you can kill about 733 birds with one stone (forgive the exaggerated metaphor.)

Good luck and happy practicing!
:D