Keybind for Target Lock-On

Please add a keybind for PC users so that we can manually toggle lock-on target. Currently the only way you can lock-on to a target is by enabling the setting "automatically lock-on target when auto-attack is initiated" or through gamepad (L3 when you have a target. Otherwise L3 just draws or sheaths weapon).

Normally I would not have a problem with the setting to automatically lock-on to a target when initiating auto-attack except for the fact that if you use this feature while fighting, say Titan, well... you won't live very long.

TLDR: Please add a keybind to toggle lock-on to current target.

Thanks.