Rover-3.6 will support the NAV_GUIDED_ENABLE and DO_GUIDED_LIMITS commands much like Copter does so it would be nice to have these two commands visible in the commands list.
One small change that is coming is that we will allow the user to set the Lat,Lon,Alt for these commands. This position will then be sent to an external navigation controller (like ROS's path planner).
The PR on the ArduPilot side is here.