This is a very delayed response to the original question, but in the name of posterity and searchability, Bonfire 2.2 added support for custom fields provided by third-party plugins, including mandatory fields.
For more details, see the release notes at https://confluence.atlassian.com/display/BONFIRE/Bonfire+2.2.1+Release+Notes#Bonfire2.2.1ReleaseNotes-Supportforthird-partypluginfields
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