Double tap W on the keyboard and hold it down.
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You can press w twice and hold it and it will make you sprint.
In the new Beta 1.8.1 update hit W twice then hold and you can also hold down and jump to do a sprint jump which can jump atleast two blocks long.If you mean sprint, you double tap and hold the button you have for walking forwards.
To sprint, double tap the forward button, but beware, as this drains your food exceptionally fast.
Manaphy is 151
To zoom out you hold 'Fn' and then click one of these buttons F1 F2 F3 F4 F5 ( it depends ). All of these are on your keyboard. To speed up or sprint double tap the forward button.