Concept: Holding down a button slows the ship and charges power, like Charged Shot. Releasing the button rockets the ship forwards at high velocity.
There are several different ways this could be done. It could be a specific body, or even a super mod. It could either replace the normal thruster, or it could be an option alongside the normal thrust.
An example of implementation is as a super mod, requiring Stabilization and Charged Shot, where holding the Stabilize button would also charge up this launch.