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Speaking of crouchspamming, there’s a weird thing you can do. 
If you slidespam really fast, you can move around the same speed as sprinting, but be crouch spamming. I’m not sure if this is useful in combat, but you can try.

I used it with hold, and tapped really fast. It’s also best to use this on flat ground, but slanted downwards ground works too. (If it’s too slanted, it might temporarily prevent you from actually crouching fast enough)

I’m not sure of the exact speed, since I can’t really use the debug menu, but it feels to be around normal sprinting speed.