I do have these posts from a few months related to that dash mechanic and detecting double jumps. You could take a look at them maybe for ideas?
Something worth noting if you’re not going to read this is that the Speed Modifier device does not update until the player touches the ground in Platformer Mode. Unfortunate!
As for particular climb mechanics, could you perhaps list a particular chapter that you want to mimic or a specific mechanic you want to make?