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To choose different grenades is bit slow in the game. One good solution is to use a pie menu for that!
I would prefer different keybinds for each grenade type :
https://forums.focus-home.com/topic/36358/we-need-different-keybindings-for-flashbangs-grenades-incendiary-grenades-rpg-and-c4
Both options could be implemented for us to choose!