Coiling - While in midair, hold crouch to make your body smaller.
If the game doesn’t already do this, do it, so people can keep their speed when jumping over objects or through windows.
Spring Jump - Press jump just before you hit the ground to go a bit higher into the air, works only once, so you can’t bunnyhop, but you could chain it with wall jumps.
Just adds more to the speed of the game, so carefully timed presses allow you to get where you need to be quickly. This wouldn’t quite be the same as bunnyhopping, but rather instead allow people to get extra height on their next jump if they time it right. But you couldn’t do it twice, the game will force to stop the next time you hit the ground.
Sliding - Pressing crouch while running will allow you to slide, there is no special animation, you’ll just gradually go into crouch walking speed rather than the instant you press crouch.
Just allows more flexibility, and maybe would add more to the game later on if we small nooks we could slide under.
Just some things that I thing would be easy to add and still would add a lot to the game.
