In the readme it says we should set the custom_visual_editor_boot_options in the admin.js file.
However if one uses:
rake refinery:override javascript=admin
it generates:
if (typeof(custom_visual_editor_options) == "undefined") {
custom_visual_editor_options = {};
}
The latter will not work. It should be the variable from the documentation: custom_visual_editor_boot_options