I've dug through most of the 'Uno Punto Zero' suggestions, and the one I haven't found (which I'd expected) is the proposal of adding a third, 0.1" grid compatible row of headers, like a Seeediuno.
I am not suggesting that the existing headers are changed. I am only suggesting that another row of holes, next to the 8+8 digital/PWM row of headers be added.
I apologise for my ignorance, but is there a reason that this has been ruled out that I have missed?
For the young people I work with, the awkwardness of the headers is one of the obstacles to them creating their own electronics that we talk about. If there were 0.1" friendly pins, we could use stripboard, veroboard, or matrix board to make shields. It might even make real PCB's easier to make because we could use 0.1" matrixboard as a guide on a drill press.
We have used the 'bent header' technique, which is relatively doable. It is a bit nerve wracking for folks new to hands on projects, who may be worried about breaking stuff, which appears to put off some teenagers. IMHO, it is better to make it easy.
Looking at an Arduino/Freeduino PCB, there may be enough room.
I admit it would disimprove the silk screen, which is an important part of the physical interface, and may be the reason it has been ruled out.
If I've missed the explanation for why this is 'verboten', please don't flame me to a crisp.
If I haven't missed the explanation please don't crisp me up either :)