As an avid user of mouse keys when I was on Windows, I grew accustomed to fast dropping of inventories, and perhaps the best usage of mouse keys in my eyes, fletching bolts.
However, since the changeover to Mac, I haven't been able to use Mouse Keys very extensively, due to the noticeable lack of a "hop" feature (on Windows, this is invoked by pressing the Ctrl button while a key on your num pad).
Example usage:
Withdraw 5 items in one tick (press ++5, then hop up etc.):
http://www.youtube.com/watch?v=1ITHBR2H7Hg&feature=relatedMaking bolts (5, hop up, +, hop down, + [only do five the first time]):
http://www.youtube.com/watch?v=K7pkEFXrDmUYou can also use them to relieve strain when teleporting for magic, or alching.
So, does anyone use them?
Also, does anyone know of a nice (legal) mouse keys emulator for macs, or a way I can make my machine do the hop (I habe a Macbook Pro, 10.6.4)?