When you're drawing on the tabletop, you are creating a vector-based drawing. Each vector line/shape is a series of mathematical expressions that tells the application how the object is to appear on your screen. This is why your line remains crisp if you increase the scale of your drawing.
An eraser tool that you would normally find in MSPaint/Gimp/Photoshop is used for raster-based images, not vector. A raster image like a BMP, JPG, PNG, etc is comprised of a large mass of pixels. An eraser tool is used on raster images to remove said pixels.
yep, sounds like selecting and deleting them one by one is already and will remain the best course of action.
Not to hijack this topic, but Kristin, I have a post up about the Fog of War and was wondering if yew can shed any light on how it works too?
<a href="http://community.roll20.net/discussion/3396/fog-of-war-issue-environment-layer-and-video-chat-fails#Item_1" rel="nofollow">http://community.roll20.net/discussion/3396/fog-of-war-issue-environment-layer-and-video-chat-fails#Item_1</a>