Hello
Hot deploy of html files works out of the box (nothing to do with IDEA or the plugin).
A shot in the dark:
-make sure that after changing a html file, the resources gets updated (make your project with Ctrl+F9)
-in a default wicket application, resource reloading (hot deploy) is only enabled in development mode, in deployment mode it's disabled.
see also org.apache.wicket.Application#getConfigurationType and org.apache.wicket.settings.IResourceSettings#getResourcePollFrequency
-maybe there are something else prevent you from hot deploy (your browser, app server etc..).
How ever... I've tried with wicket quickstart and hot deploy worked as expected, so something in your configuration or your environment prevents you from hot deploy.
To answer your question: The plugin does nothing regarding to hot deploy.
Regards
Minas.