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This is definitely possible using the matplotlib object underlying the plot, or even by hacking the underlying Sage code that tells it to go there. See plot/graphics.py, esp. lines like

            subplot.spines['right'].set_visible(False)
            subplot.spines['left'].set_position(('outward',10))
            subplot.yaxis.set_ticks_position('left')
            subplot.yaxis.set_label_position('left')

which should give you an idea of what matplotlib stuff to fiddle with.