the same as the two finger scrolling option (could be disabled, too, opinions
welcome).
* Added a new settings to disable horizontal two finger scrolling, since it's
not that easy to only scroll in one direction with this. Maybe a higher
starting boundary would also be an option for this instead, Clemens what do
you think?
* Minor cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33468 a95241bf-73f2-0310-859d-f6bbb57e9c96
fc548b41f3