You can use same double tap idea - first tap triggers hint, second in a few seconds - restart the level, or button needs to be pressed for some time.
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Ah, sorry, I was confused because that's exactly how the existing "double tap p" mechanism already works, but you're saying that with that in place the danger of placing it on 'r' should be minimal. It's a good point... I'll consider making the change. Thanks for helping out, I really appreciate it!