Not trying to be contrary and I would love to see a jump function as well, but I did just achieve the 35 second jump achievement on PC. Just takes the low gravity planet, a large mountain and a mix of jump/boost while airborne.
I can confirm that the life support bar is decreasing even with the option activated.
Also perfectly achievable on PC if you use a gamepad.
The gamepad allows the player to tilt the nomad while in the air (left stick).
The keyboard + mouse combo indeed lacks that keymapping, for reasons unknown.
Yes but not everyone know how to play with a gamepad or afford one. In my case I dont have the money right now and even if I did I would rather invest it into something else, like a new game or a dlc.