That’s the point of the paralyzed arm example, where you don’t have psychokinetic control.
For any instance of an actor engaging in wishing, there are only two possibilities: The actor either (1) believes that his wishing could set in motion a process that will remove some of his felt uneasiness, or (2) he doesn’t. It is key that we avoid taking the position of the critic (third-party observer), lest we forget that what matters in praxeology is not whether the wishing “really could” result in a betterment of his conditions, but whether the actor himself believes it could.
If what I wrote in the previous paragraph makes sense, then if the actor is wishing to leap a 10-story building psychokinetically, aren’t we then proposing that it counts as action if and only if he believes he really could do it? (And, is it really possible to wish for something to happen while simultaneously believing it is completely impossible? - as opposed to a moment later when you come to your senses)
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As for the example of using a lever to move a boulder, it seems to be more complicated but the same in principle. That is, pick a stage in the setting up and using the lever - then we’ll be able to show that wishing=action at that stage. If, for example, there’s already a lever set up, your hand is already on it, and you know how a lever works, all you have to do is push (by wishing your hand down).
If we rewind, it seems we will simply find a succession of mini-applications of that same wish-motion, except for the thought components - but in the purely mental realm (psychological actions; cognition) it is surely even harder to find any difference between wishing and action (can you wish to make a choice without making that choice? Can you wish to imagine what that wooden 2x4 will do when placed in the position of a lever for the boulder and pushed, without imagining it? (Can you wish to imagine a pink elephant without imagining it??)).