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For #2, you can save your plan to a variable once it's been made and execute it again.
In the python moveit commander interface you can use the "plan()" function from the move_group node which returns a plan that can be saved to a variable. For reference - https://github.com/ros-planning/moveit/blob/kinetic-devel/moveit_commander/src/moveit_commander/move_group.py#L434
You can then call the "execute(plan)" function from the move_group node to execute a previously planned path. For reference - https://github.com/ros-planning/moveit/blob/kinetic-devel/moveit_commander/src/moveit_commander/move_group.py#L458