How does JBoss EAP 6 manage System.out?

Issue

• While using System.out.println() in EAP 6, this call gets sent through JBoss LogManager and ultimately gets written by the JBoss ConsoleHandler. Why users can not log straight to System.out?
• While installing our own ConsoleAppender for the application, getting the output like this:

11:35:36,582 INFO  [stdout] (http-/127.0.0.1:8080-1) DEBUG [http-/127.0.0.1:8080-1] [com.redhat.gss.log.LogbackTest] - ***DEBUG: Kyle
11:35:36,583 INFO  [stdout] (http-/127.0.0.1:8080-1) INFO  [http-/127.0.0.1:8080-1] [com.redhat.gss.log.LogbackTest] - ***INFO:  Kyle

Notice all the above logs are at INFO level regardless of what is configured, and every message is prefixed with [stdout]. Why does JBoss interrupt with our ConsoleAppender?

• How can I separate STDERR and STDOUT logs from server.log in JBoss EAP 6?