Continuing on the modular path that I started with the powergrip upgrade. I moved the speed boost powerup from the suits back thrusters and placed the boost "module" on her thighs, taking use and transforming the legarmor Samus get from the varia into the main componet of the Speedbooster.
I am also thinking up a way to demonstrate how Shinesparking works, I figured that parts of her armor is actually working together to create these "secret" moves. At the moment, what Samus needs to do the shinespark is a Jump module outfitted in her thrusters (normally Hi-jump boots). When running and getting to high enough speed, she stores the kinetic energy, transferring it to the thrusters.
So in short: Jump boost + Speed boost = Shinespark.