Custom roles are not possible in Express, from the guide:
Quote:
The following activities are available with BlackBerry Enterprise Server only (not with BlackBerry Enterprise Server Express):
- Set up and manage the high availability architecture
- Wirelessly deploy BlackBerry® smartphones
- Set custom administration roles
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http://ae.blackberry.com/services/bu...l/features.jsp
So you need the full BES to create new roles or edit existing ones.