Throw weapon
bind "x" throwweapon

Simple Leaning
bind "x" +leanleft
bind "x" +leanright

Dynamic Kicking
Press the kick key to kick (K by default)
(Change bind and force in "Q" - "Options"

Quick Grenade
bind "x" quicknade

Freelook / AltLook
bind "x" +freelook

Simple Holster
Press 0 to holster or unholster your weapon.
bind "x" holsterweapon

Prone
Double tap crouch button

Quick Knife
bind x quick_codknife