Default value for custom fields in New Issue

[Lukman Chow]

Was posted in develper list.
Re-posted here hoping to get better response.
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> Hello,
>
> In our Eventum setup, we created several custom fields (date type, drop
> down, string).
>
> When user create a new issue, we would like to populate those fields with a
> default value based on certain criteria. Example: user's region based on
> user's email-id, date = system's date, etc.
>
> How can it be done?
> Please advice. Thank you for your help and attention.
>
> Sincerely,
> Lukeman
>