In my modpack, I'm adding four different jetpacks. Each one will excel in a different role, so they're sidegrades instead of upgrades. One of these will be the Cloudrider Jetpack which I want to have excellent vertical speed.

While playtesting, I noticed that just increasing the vertical speed makes it difficult to control. I'd like to give it 50% more vertical speed and increase the sprint_speed_multi so you can ascend at a more normal speed or hold control to ascend quickly.

I did the same thing with my Explorer Jetpack but with horizontal speed. It travels 50% faster horizontally, but much faster while holding control. It feels really nice. I can move fast enough to explore while holding control, but slow enough to land on one-block platforms while not holding it.