In Title Update I would like to see two options given, for custom games, that modify the Jetpack.
Acceleration - How quickly you take off. The current Jetpack has a fairly slow acceleration.
Duration - How long you can use your Jetpack for. The current Jetpack has a fairly long duration.
Using these two modifiers you could set the Jetpack to accelerate extremely fast but have a short duration giving your player a rapid boost skyward but only for a second (among many other configurations that would possible).