add push mode

Blender has been developing some interesting 2D features lately with the grease pencil and there is one tool id love to see in toonboom harmony.

Basically, when you draw a line and then go to sculpt mode, there is a tool called, the push tool.
This tool helps move smoothly around the lines to reshape the drawing quick easy.
This especially is useful for making in-between drawing without redrawing the whole thing to create a smooth animation for frame by frame animations.

Here is a quick example where around halve of it was just pushing the lines, speeding the process Dropbox - mlpht12fps.gif - Simplify your life