Mouse-wheel operations
If you have a mouse with a wheel; you can:
scroll the wheel to scroll
up and down
hold down Shift to scroll
left (scroll the wheel up) or right (wheel down)
hold the wheel down to slide
the document around in the window
click the wheel to center
the view around the mouse pointer
Shift-click to zoom out
CTRL-click to zoom in
Hold down CTRL for variable
zoom in (scroll the wheel up) or zoom out (wheel down).
Feather tool
You can control the feather slider with your mouse and keyboard. When the feather text box or slider are selected:
Mousewheel up/down—increases or decrease feathering
Mousewheel up/down while holding the CTRL key—increases or decrease in larger increments
Arrow up/down keys—increases or decrease feathering
Page up/page down keys—increases or decrease in larger increments
Hom/end keys—select minimum or maximum feather values