An "alternate fire" or perk (depends on balancing) for the jet-pack that allows you to expend all fuel for a double jump or perhaps a general directional dash (even straight down). This can be useful as when someone is firing at you a quick double jump can throw off their aim and allows you to throw speed or health paint which can allow for that extra little bit of survivability whilst also taking full advantage of the jet-pack system provided whilst also leaving you without any fuel to avoid movement system abuse, you could even add a balancing factor that makes the jet-pack "overheat" temporarily after using the dash basically just delaying the fuel regeneration.

EDIT:

The best thing i can compare it to is the dash ability in doom eternal or the thruster pack from halo infinite

TL;DR
Jet-pack alternative fire or perk (depends on balancing but i feel it should be base kit otherwise i have a feeling it could end up being a "Meta perk" due to survival)

Allows for a dash in the chosen direction (upwards and downwards dashing may be hard to implement due to limited and/or disruptive controller/key-bind requirements )

expends all fuel

Fuel regen delay due to "overheat" upon dashing