I second that, Eraser and fill as a distinct tool rather than a brush setting would be preferable.
Another thing that is still missing in regards to this:
In GP2 with brush selected I could hold the ctrl key and erase, then hitting the alt key would erase strokes, shift key would erase points, without a secondary key the current setting (dissolve,point,stroke) of the eraser tool would be used.
Maybe this is on the to do list already, but I just want to mention it here because it was such a useful but also pretty hidden feature and I fear that it might be overlooked 