A side effect of the design goal of the QWERTY keyboard is that it is non-optimal for a cursor interface. It comes from mechanical typewriters with a semi-circle of levers. Pressing two levers close to each other causes them to collide and jam. The distribution of letters in QWERTY is designed to make this less likely by placing letters which follow each other in words far apart. That means they are many cursor keypresses apart. By design this should be less efficient (for a cursor) than a random arrangement of letters. Care to test?