Have you guys tried jetpack-cutting while pressing A or D? It's a little similar to what you're describing.
Viewing post in Sliding?
You can just normally walk/jetpack a jumping robot.
Unless you turn into like a ball kind of thing in metroid, I'm pretty sure the body can't slide between the robot legs.
It is a good idea though. Maybe instead of sliding, there can be a sliding kick. It can be activated while kicking during a boost/jetpack thingy.