Is there any other means of scrolling using a mouse besides the wheel or dragging the scroll bars on the right side of the window. Using the wheel is not good for me ergonomically and it is a hassle to move the pointer to the narrow scroll bar and drag that up and down. In Firefox you clicking the middle button goes into a special mode that enables scrolling by moving the mouse up and down. But as far as I know Chrome and other applications don't have that feature.
Ways to scroll with a mouse without the wheel or dragging the scroll bar
mousescrolling
Related Solutions
System Prefs -> Mouse. Toggle 'Scroll direction:natural'.
Try putting this into your private.xml file. Select the top option (Toggle CursorMove -> ScrollWheel) in Preferences/Key Change tab and this will toggle the option below (using simultaneous press of trackball LEFT/RIGHT buttons). You could use KeyToKey instead of SimultaneousKeyPresses if you just want to use a single trackball button press.
<vkopenurldef>
<name>KeyCode::VK_OPEN_URL_SHELL_toggle_cursormove_scrollwheel</name>
<url type="shell">
<![CDATA[ /Applications/Karabiner.app/Contents/Library/bin/karabiner toggle private.pointing_relative_none_to_scroll ]]>
</url>
</vkopenurldef>
<item>
<name>Toggle CursorMove -> ScrollWheel</name>
<identifier>private.toggle_cursormove_scrollwheel</identifier>
<autogen>
__SimultaneousKeyPresses__
PointingButton::RIGHT, PointingButton::LEFT,
KeyCode::VK_OPEN_URL_SHELL_toggle_cursormove_scrollwheel,
</autogen>
</item>
<item>
<name>CursorMove -> ScrollWheel</name>
<identifier>private.pointing_relative_none_to_scroll</identifier>
<autogen>__PointingRelativeToScroll__ PointingButton::NONE</autogen>
</item>
Best Answer
Looks like someone already answered this on SuperUser
SmartScroll is a third party app I've not used, but appears to enable this.