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Re:Power-touch – Shortcut touch keys on mobile by vaqm on Tuesday November 08, 2016 @03:14AM (#12898520)
This has exactly what you are looking for, including USB support: http://quadro.me
Re:Power-touch – Shortcut touch keys on mobile by 50CNT on Tuesday November 08, 2016 @11:29PM (#12906051)
That is pretty cool. Sadly iOS and Windows only, whereas I'm running Android and Linux.