This setting should be added at the same level as filter and is a boolean.
Depending on its value, the YUI configuration generated by the ez_platformui_yui_config twig function will instruct YUI to use a combo loader.
When true, the configuration should become something like:
When false, combine, root, comboBase and combine at the module level should be omitted. In a first step, the template modules won't have the combine flag.