Yes, it "would be kind of nice" if HL did that, but it doesn't. I had to push a few times to get the dice roller on the iPad to even use some kind of animation so that you could tell that a second button press was even accepted! And I've asked for text highlighting to indicate a critical hit (a green background color for the text of rolls that are potential crits and a red background for potential critical failures), but no luck so far.
It would also be helpful if there was a log of recent rolls a la the hit point modifier panel which shows a damage/healing log.
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