Flow chart for DS4 controller interface?

[Niwashi]

There are basics such as pressing "X" button to target nearest target-able thing based on your current target rule

The X doesn't use your targeting filter. It uses its own built in set of priorities. I know NPCs and objects are prioritized above players (which is useful if a quest giver or summoning bell is surrounded by people — just hit X and get the right thing). And mobs seem to be prioritized at the same tier as objects (which is kind of annoying when playing botanist or miner, and it keeps selecting a nearby creature instead of the gathering node I'm heading for). But it will select the nearest player if nothing else is around.

It's only the left/right button cycling that uses your selected targeting filter.

There isn't really isn't too much in terms of changing button binding, but you can modify how targeting works and how your L2/R2 keys work for quick access to expanded/other cross-hotbar.

You can also configure L3 and R3 (pressing the analog sticks). I don't remember what the initial defaults are, but I remember I removed the default action for R3 because I had too much tendency to press it accidentally by gripping the controller too tight when I got excited. (My current setup has L3 draw/sheathe my weapon —which I still do accidentally sometimes— and R3 does nothing.)