Believe that the number sequence is hardcoded into the program. You could however create a new custom revision tag and use text instead of label, but it would not be "smart", so you´d need to manually update that parameter.
Also you could try this:
1. Change your first revision to Alphabetic.
2. Change the alphabetic sequence and insert the letter "O" at the front of the group.
3. Change the second revision to Numeric.
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Using the alphabetic sequense does not work. You can't put numbers into the field. I too would like to be able to make the first revision '0'.
When you change to alphabetic you put the character O, that looks like 0 (zero).
You cant insert a 0 (number) but you can insert unicode into the alphabetic sequence. So when your ready for a zero, insert alt0216 ( Ø ) into the sequence. This is less likely to be confused with the letter O (hopefully your not upto revision O, as thats a lot of changes)