This is necessary, because the survival mode need to be a hard mode, if you want to see your skins, set, etc... play in open world.
I agree. How someone can jump a lot of times and don't feel tired? If you jump inside a safe zone your stamina decreases... this could be add out of the safe zone too. I suggest each jump uses 1 little bar of stamina.
Maybe you could fortify some abandoned house in the cities. Of course you could be raided by other players.
This is good, focus in other habilities, but don't in the jump stamina haha.