As a long time Player of Wolfenstein :ET, who hasnt played the Beta of QW:ET…
Tell me, does QW:ET have that annoying I-can-lean-around-corners-and-sometimes-even-prime-a-grenade-without-having-a-player-animation-for-it-so-I-can-camp-more-effectively feature?
there is an animation
but I personally dont use lean, I have no free keys
its more fun to use stroy-to-health in combat and have keys for knife and weapon, who needs lean?
more then animation, there even is hitbox which moves actually so you can be hit 
lean is good to defend long corridors. on shorter distance it’s call “throw nade here!”
Yes, you can lean in ET:QW and even shoot normally while leaning, not just grenades.