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I did some modifications to DWA local planner and Base local planner. My modified DWA local planner currently support to navigate the robot to the a goal that is opposite to its orientation. I have tested it in Gazebo and also on my real Robot.

I totally made 4 changes to both DWA local planner and Base local planner. The files I modified are:

1. dwa_local_planner/include/dwa_local_planner/dwa_planner_ros.h
2. dwa_local_planner/src/dwa_planner_ros.cpp
3. base_local_planner/include/base_local_planner/latched_stop_rotate_controller.h
4. base_local_planner/src/latched_stop_rotate_controller.cpp

You can refer to the changes of my fork of navigation stack:

https://github.com/HappySamuel/navigation

I have marked the changes i added/modified with //SAMUEL in those files.

Hope this can help to solve your issue.