It'd be nice if the JIRA plugin allows some customizability to the content of the comment it posts to JIRA.

The abstraction could be as simple as a sequence of JiraCommentContentGenerator or whatever, where we just allow each of them to generate some content and concatenate them together.

More sophisicated kind of such JiraCommentContentGenerator could then offer template language capability like email-ext plugin does, but a number of default implementations that do reasonable things would be probably good enough for many.