I think that there should be a "when blank is not touching blank block. It should also be something that you could use for the check once if block.
You can already do this with code. Try searching it and I think you'll find the code.
I think thats a great idea! You could use it for a game like Flappy Bird!
I was thinking to use it for a mario game, actually!
Yeah!! I hadn't thought of that! (I dont play mario :P)