Hmm... the line showing off your's jump trajectory is supposed be visible only when player can jump. That didn't work for you?
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I don't think so, I was clicking and nothing was happening, though it did work a lot faster sometimes - might be some timing issues, I've only noticerd I forgot to time my flies when my wife played my game and it was much faster on her PC - a basic mistake, but I missed it anyway.
Have you tried it on other machines? And with UE4, the build can vary a lot from what is going on in the editor (I can't remember if it was UE4, but I think so).