Hello SiKing,
Thank you for your feedback. I agree that the ReadyAPI Maven Plugin documentation can be improved. Specifically, it would be good to have all the Test Goal Settings in one table on the "Maven Plugin Configuration Reference" page. I've created a corresponding Documentation task. Note that currently, all the settings for this goal are listed in the sample POM file here: https://support.smartbear.com/readyapi/docs/testing/integrations/ci-systems/maven/working.html
Regarding the incorrect setting name for the Tool Goal ("outputdirectory" instead of "outputFolder"), thank you for pointing this out. I've asked our Documentation team to correct this.
An equivalent of the command line switch "-A" isn't available for the plugin. I recommend that you post the feature request here: https://community.smartbear.com/t5/ReadyAPI-Feature-Requests/idb-p/ReadyAPIFeatureRequests