The controversial eraser tool

[handrawn]

attached is a screenshot from sketchbook designer in vector mode

rather than an eraser as such it allows you to just jiggle the mouse along the length of the vector line and it varies in width organically [adding or subtracting]- note it is still a line and not a shape - this sort of organic sculpting is at least as useful as a true eraser and very very quick to do once you get the hang of it, it works a lot better than illustrator, more like the old pre Microsoft Expression3 brought up to date and a lot quicker than messing around with shapes and nodes for the organic stuff