Nice one, a very similar scheme already exists, though. It's very old, probably before the existence of the PNG big maps. The name is Trick Before Attack, there are other similar schemes like Trick WxW, Darkmitch's Fly for Weapons and Pro Basketball. I was planning to create a different variant using this same concept too, but with crates determining the tricks for you. For example, you got a dynamite in a crate, then you would need to do the trick that allows you to attack with this dynamite (the tricks would have weapons under the tricks, so if you do that trick you will be able to attack with that weapon. These tricks unlocking weapons on a map already exists, but it doesn't have crates and you can choose the trick you want to do. My idea is that collecting the crate will force you to do the trick of a weapon you have some ammo. But I never worked further on this idea, not sure if it would make so much difference in the gameplay.