So about jump.

[Arcell]

... seriously?

You're asserting that it's beyond SE's means to determine where people can and can't jump, in a virtual 3D environment entirely of their own design and construction?

Two words: Collision Mesh. An invisible, convex mesh that is positioned around or above another object that prevents objects from passing through them. They're used all over the place in games. They're pretty much a mandatory part of 3D modeling for real-time environments. Yes, even in FF games.

Now... Take a guess how SE could stop someone from jumping up on top of a small tent if they didn't want them to?

So you would trade the ability to jump on top of objects you believably could reach for the lack of ability to jump on objects that believably wouldn't support you?