If you lock on a Target you can change the Target with R3(Xbox360-Controller), but only if Lock Toggle(Gamepad) is activated in Menü,
if turned off, you cant change Targets with R3 anymore. You have to stop locking on and lock on again which can take a second and stop the flow of the battle.
Ive died several times because of that. Target Switching via Button R3 should be enabled even with Lock Toogle(Gamepad) deactivated !!!

I would also appreciate to be able to change the buttonconfiguration for the controller like i desire. I personally prefer LB to lock on instead of LT since it fits better to my grip and other small changes. But R3 stop working cause Lock Toggle configuration is a disaster.