you can assign nav functions/behaviors under the KEYS tab inside PREFERENCES...pretty much every option you want can be set there. The SCROLLING tab just controls scrolling behavior itself. I have my scrollings set to the buttons on the D-pad and also setup behaviors/functions for each screen rotation. It's actually as cool a config as you might want...just not obvious until you actually look at the tab...I over looked it for a long time before fiddling with it.
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