Fine tune controls for InPaint for images with similar colors / poor contrast

Inpaint has difficulty in replacing the correct / precise part of the image if there is not much contrast in the parts of the image. It it as also diffucult to precisely select the area to be changed (Important where there is not much contrast between the parts of the image or colors are similar). SOLUTION add the following controls: Add CTRL Z to undo last mouse movement Add Shift "draw line" to force vertical horizonal or 45 degree line Add the ability to start with a mouse click and simply drag anywhere to form a straight line, then let go Allow user to select line thickness Move drawn line with arrow keys after drawing line, to place it more precisely -- all of the above are basic controls in MS Paint PLUS: Give user a slide control to be more or less sensitive to where colors or contrast are similar.