[Q] Double tap possible?

My new fancy moto x play is missing a decent feature to check whether I have new messages. I do dig the moto display function, but it isn't enough.

With the lack of a button on the front side of the phone you have to reach up to the side. It's a minor inconvenience, but still...

Double tap would be great wake the phone, but I doubt it can be done at this moment as there's no root yet.

Any thoughts?

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