The ability to erase using a line tool instead of a pixel brush

[BCS]

I think this could be useful sometimes when "cutting" out edges after using contour tool.

[dacap]

Actually you have two different options:

1) You can use the Eraser tool + Shift key to create a line between the last clicked point and a new mouse position.
2) You can draw with the Line tool and select the transparent color ("Mask" button when you click the Foreground color button at the left-bottom corner)

[BCS]

#2 sounds good, thanks. I found it! https://i.imgur.com/TSLNX2v.png