Due to optimization reasons you should register at least one of the built-in modules in case you want to register a custom module. If none of the built-in modules is not registered then to reduce the amount of outputted HTML content the code for the custom modules is also not imported. For that reason you should register at least the Statistics module and to hide it just set its Visible attribute to false, e.g.
<module name="RadEditorStatistics" visible="false"
<module name="MyModule" visible="true" enabled="true"/>
You can also hide the ModuleManager tool <tool name="ModuleManager
" /> so that the user is not able to show the statistics module.
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