Note, as of CommandBox 6, the old format of experimental Runwar args that look like --name-here is removed. There is a new syntax for specifying arbitrary experimental flags.
There are not any experimental features in CommandBox, but you can influence the JSON file used to configure runwar with the following syntax.
The struct you specify will be merged into the JSON file that is sent to Runwar. Note, this JSON format is undocumented and subject to change.