JavaHelp 2 supports additional entries in the helpset file, such as an <impl> section; see the JavaHelp System User’s Guide for information about this feature.
To add custom entries to the helpset, list the code for each entry in the following configuration-file section. For example:
[JH2_HelpsetAddition] ; Optional section used for literal additions to the JH2 <helpset> <impl> <helpsetregistry helpbrokerclass="javax.help.DefaultHelpBroker" /> <viewerregistry viewertype="text/html" viewerclass="com.sun.java.help.impl.CustomKit" /> <viewerregistry viewertype="text/xml" viewerclass="com.sun.java.help.impl.CustomXMLKit" /> </impl>
You can put anything you please in section [JH2_HelpsetAddition], and whatever you add is included in the helpset file; for example, you can add your own <presentation> sections.
If DITA2Go does not rewrite the helpset file each time (see §20.3.7.3 Deciding whether to rewrite the helpset file), you could simply add custom sections directly to the helpset file.