Just a few thoughts about what others have said.
Our experience with neurofeedback was kind of disappointing. Wouldn't advocate you go that route unless you have lots of time and money.
Is this playing with pencil etc new? when we raised my son's stims a few years ago, I think it made him more anxious and he started tearing up and chewing on paper, really chewing on things. So if this is more a problem since he started the Concerta, I might look at that. The dose may be too high for him still.
Also echo what others have said about it possibly being anxiety. Squishie balls were also recommended for my son.
Finally, one of the things that is most misunderstood about ADHD is that children can attend fine to the things they find interesting. My son can play his gameboy or do other things for hours. It is really characterized by much more variable attention than anything.
Is the issue that he isn't focusing on his work at school? Is this new? Has a functional behavioral analysis been done? If you do get it done, make sure they analyze his behavior across a wide variety of tasks to get the true picture.
good luck figuring out what can help.
