It's quite easy to learn the Morse letters in a couple of evenings using one of the computer based tutors. Or get a fancy Garmin, and let it do the identing for you.
Not really needed for PPL, but why not have a go anyway and surprise your instructor.
Although there is no more "Signals" test for CPL, I think that it is still a required part of the training syllabus.
You probably only need to remember about 2 or 3 local beacons on the PPL course.