A really handy feature would be a toggle button to change the value from positive to negative and vice versa in the dialogue boxes.
Often when extruding you pull one way or enter a value, only to realise the preview is showing you the opposite of what you want.
So you delete the value and type it in again or you use the home key and add a minus, however its done at the moment is not a slick as it would be with a +/- toggle in the box.
Enter the value or pull, check the prieview, hit the toggle job done!!
Nice!!