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Zero is a fist during your hand signal motionsI use this same method....but I do use zero as needed such as in compass headings or other number combo's were the zero is important.
Yet another method:
1-2-3-4-5 = one, two, three, four and five fingers, respectively.
6-7-8-9 = one, two, three and four fingers, respectively, with your hand turned 90 degrees.
edit: http://www.advanceddivermagazine.com/FreePDFs/Onehandnumbering.pdf, though I see no need to signal "zero."
Zero is a fist during your hand signal motions