Alt + Enter:                 Select “OK” in the Wii keyboard screen.
Alt + Backspace:        Select “Quit” in the Wii virtual keyboard screen.
Up Arrow:                   Scroll page up.
Down Arrow:               Scroll page down.
Left Arrow:                 Scroll page left.
Right Arrow:               Scroll page right.
+ Sign:                         Zoom in (also num pad).
– Sign:                          Zoom out (also num pad.
Backspace:                 Previous page.
Ctrl + Left arrow:       Previous page.
Ctrl + Right arrow:     Next page.

Thanks Elson for the heads up!!

Link