Erasing by using the front rocker switch is the best way.
Although it is a bit frustrating because the ideal setting is not possible.
There are two settings with different consequences and unfortunately they cannot be combined
1)-RMB Erase using the Rclick setting on the toggle switch of the pen
this gives instant erase (provided the drawing tool is set to drying)... but the erase size is always the same as the drawing brush.
which is not ideal because in most cases for faster result you'd want to have it slightly larger.
2)-RMB Erase by setting the pen switch to Erase.
this gives you instant acces to a eraser of you preferred size... which is great...but you loose the RMB acces on the pen.
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i would ideally want to have both the RMB on the pen AND have a wider eraser.
but i havent found a solution.
another erase strategy i often apply, in cleaning up larger areas is using the freehand fill tool option in combination with RMB