Interesting stuff- might provide someone with help.
But there's still nothing much useful for Player vertical control 'Y'.
The jetpack thrust will make the player go up, but it's very finicky--
it follows a bell curve value. Even worst between water level and out.
So a person still has to strong- arm it and customize everything
related to that in script. Oh well-- that's not so hard-- it get's hard
when the engine fights back (gravity) on what you want to do.
Well, solid state values are the best for mimicking the intent anyhow.