Docs are confusing - do we support svgedit-config-iife.js/svgedit-config-es.js configuration mechanisms?

Documentation states that "Note that one may create a svgedit-config-iife.js file within the project root directory as of v3.0 (or for v2.8, within editor/config.js) and add such configuration directives to it without needing to modify the repository editor code" See https://github.com/SVG-Edit/svgedit/blob/master/docs/tutorials/ConfigOptions.md

This does not appear to be supported? Or have I missed something obvious.