Currently the only support for help information for a third-party plugin is the standard (mostly empty) action page in the wiki (https://wiki.keyboardmaestro.com/action/Plug_In) and the short tool-tip help specified in the plugins plist file.
I'm writing a couple of plugins and need to link to some detailed help information about them. A pdf or html file in the plugin's folder accessed vie the standard gear icon on the plugin itself would be perfect.
Is this something you could add to your todo list please Peter @peternlewis?
The use of the wiki is the current standard way of providing help on actions so - yes, that would be great as it maintains consistency. And adding an extra key to the plug in spec. would be a really easy way (for me) to make use of the facility.