Lefty and screen.region_flip

Hello everyone,
being left-handed I found myself digging into Blender 2.7 keymapping and re-associating a shortcut to the bpy.ops.screen.region_flip operator to be able to toggle the N panel on the left side.

Is there a way to make the left position permanent even when I close Blender and run it again? Maybe even for all other views and not only 3D viewports (node editor, texture editor …)?