Oh, you're absolutely right. That would have happened with anything except a 0 count (but 0 count shouldn't happen since there has to be something in the field list before it does anything). It was late and I was running on only a few hours of sleep - I'm not surprised I forgot the -1.
Although, someone could enter a comma in the admin options field and that would cause things to get messy. You might want to add a regex verification to that field to force a person to enter correct data from the admin side.
EDIT:
I've posted to your thread regarding the setting verification.
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