I recently joined on PS4 as well (wooooot ps4 upgrade!), Side note omg the game looks so beautiful on ps4 and omg I don't take 3 minutes to zone into an area!!! Anyway back to the touch pad. I turned that crazy thing off. I thought it would be cool I could use it as a mouse to target things in battle when my weapon is out to make it easier to do certain mechanics... NOPE! That thing was so sensitive that me touching the bottom of the controller kept moving the cursor, making it click, and basically spazzing it out. I tried lowering it's sensitivity but nope that thing is crazy. So I just turned it off and only use it to tab through the GUI like everyone else has said.