A new module to adjust the pivot position of the current layer is available from Modul8 Online Public Library. You can now set the center of your layer given 9 predefined positions and fine tune the pivot position.
Also a modified version of the module is available -->. Pivot Adjust v2 (layer and media) this version saves pivot given the Media Name and Path with also contextual to the selected layer and layerset. this gives you up to 80 pivot position per media