That's an interesting point. As it is now, the judging system gives negative GOEs only for specific mistakes. If you just do a blah element (slow footwork, small jumps), your "punishment" is that you get 0 GOE and lose the opportunity of gaining extra points for doing the element well.
The place for "punishing" a lack-luster progam is in the PCSs. So I think Van der Perren's program was scored correctly. He did lose points relative to Joubert and Buttle by not getting any positive GOEs on his spins and step sequences, and he did get slammed with PCSs in the low 6's compared to the low 7's for Joubert and Buttle.
You are correct, however, I would still argue that speed is an important technical component of footwork and should be recognized as such. I also understand why they haven't done this. It would add another layer of subjectivity to the technical scores, something they've specifically tried to avoid with their guidlines for when deductions may be taken. It gets into the realm of what's slow? How slow is too slow? What about relative slowness? Personally I think it's one of those 'know it when you see it' kind of things.
