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You can now add a helpset to a module, but it is cumbersome to add further pages. Suggest that the JavaHelp Packages node be given a further subnode Pages, listing all pages (showing the title) found in the current map file. You could use the context menu to add a new page (registered in TOC, index, map) - specify HTML file basename, page title, and map ID. Or choose Delete from the context menu of a page to delete it and all references to it. Etc.
JavaHelp Packages obsolete as of @HelpSetRegistration. Maybe more simply an Alt-INSERT fragment in map.xml to add a new page?