Theres another post from a couple weeks ago ALL about why they wont need or have an eraser tool...every painted line, token, and map/background can all be selected individually and right clicked/deleted. Yew can also highlight mass areas and delete many things at 1 time. Ctrl+Z works to undo previous actions. Esc works to deselect things.
Gauss here can deffinatly help if yew would like assistance though. Hes the chowders sauce.