KG4YBS: NO! I'm not suggesting that anyone send with one hand and copy with the other. I just knew a guy who did it some years ago. Before I used a keyboard to send CW in contests, I would send while holding a pencil, and I used to think that using two hands was a neat idea.
Don't worry about copying in your head. As your code speed increases, you will do this automatically. If you are really interested in increasing your code speed, I recommend using a great free practice program from G4FON. I think it's at g4fon.com. (try Google) Let me know if you can't find it.
73, Jim firstname.lastname@example.org