Scroll/Autoscroll preferences UI: Addition

[Robert O'Connor]

> Autoscroll [\/ 1/2] [\/ page] every [\/ 15] ticks.

Should have another dropdown:

Autoscroll [\/ 1/2] [\/ page] [\/ down] every [\/ 15] ticks.

to allow for scrolling upwards.

Best wishes, Robert