X-Cellerator hmmm. You're right, if it were that easy, everyone would be jumping like that. It's best to ask the bunny. 😉
but seriously, bind yourself to jumping under MouseWheelUp and preferably also under MouseWheelDown. When someone boosts you, you will be above the ground and when you get close to something where you could bounce (of course also the ground) start spinning the mouse wheel. You'll feel it after a while. In addition, it works when you run into a jump pad and it throw you out at a fairly good speed and it works also when using the grapple hook, when you pull yourself and start spinning the wheel just above the ground. You have to remember not to dodge before performing these jumps to bouncings.