I don’t know why it doesn’t work properly on yours, but you can change any JBoss property, just open the file run.confand add the line as at the end (at least JAVA_OPTS should be defined earlier):
JAVA_OPTS="$JAVA_OPTS -Djboss.server.config.url=new_path"
Windows ( run.conf.bat):
set JAVA_OPTS = %JAVA_OPTS% -Djboss.server.config.url=new_path
. ., JBoss Properties, jboss.server.config.url $jboss.server.home.url/conf, , , - jboss.server.home.url, . $jboss.server.base.url/$jboss.server.name, .. , ... ,