As it turns out, GreenHopper treat the story points field as a number field. Currently this feature doesn't exist at GreenHopper configuration. You could rase a support ticket, so they can open a feature request and the more votes it get, better the chance to it be implemented in future releases.
No, as it's behaving as designed and intended.
The closest you will get to a workaround is a little bit of code.
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