Ask it when we have a decent enviroment system, now is useless to ask for it.
too much physics involved, i dont know how 2.0 will manage physics, so wait before ask for climb, we dont know yet if we will have a real jumping or just jump on spot locations.
we are fighting Advanced technology Imperials with swords and rods... ask it in 2-3 expansions if we have more imperial devices involved.. our airships are balloons...
Using doors is a good way, why to waste energy?
Sandbox like minecraft is imposible in a new generation graphics game engine... u need to create an animation and result on every build, wall, to be destructed.. too much work, too much server side work, etc.
i dont get it.
FFXIV is not an Action RPG.
Conclusion: i dont like your ideas

sorry, first two are good, but not right now.