Sure. Here’s a high level IDEA (I haven’t tested and I’m on a mobile phone right now…)
Right now when you jump in air we fire a trace to see if you’re near a wall. Instead, you could just do that as long as the button is pressed, and if it returns true, instead of launching the player, just stop simulating physics on him. Then, when the button is released, you continue with the graph as is, launching the player. The result would be you stick in place against the wall, then jump away.