[culebron21]

I feel the opposite -- with half-size up/down keys, it's too easy to mis-press them. I guess it's a matter of habit.

[maratc]

I am not sure I understand this argument. With all other parameters being equal, I would assume that the larger the button is, the easier it is to mis-press that button. Half-as-large buttons should be harder (twice-as-hard) to mis-press.