I'm not sure there's a lot on hacking the core of Jira around - you need the source code for a start! https://developer.atlassian.com/display/JIRADEV/JIRA+Plugin+Development is a good starting point - although I've said you'll need to hack the group-handling code, it may be possible to do it with a plugin. The principles in the plugin guide are a good starting point even if you can't do it in a plugin
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