Uh, yeah, and those are all reasons to reject the conclusion that games (like Deus Ex) merely offer second-rate "illusory" Nakatomi Spaces compared to movies.

A human deciding to pile crates and sneak in through a ceiling window--even in a game--is a more authentic subversion of plans than reading a a tale where the author dictates the fixed story.

Beyond that, the freedom to glitch/hack/mod the game merely raises the ceiling, it does not lower the floor.