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That might not work with all apps though - Chrome would steal the first 2 taps as a zoom gesture, and some games I play would take each tap as an action.
Same issue though. With some games, I tap as fast as I can. Lots of idle tap games allow rapid tapping as an option for "collecting" stuff.
Tiny city is an example where I tap quick when upgrading things.
Would be extremely frustrating to be constantly bringing up app-switcher when playing. I wouldn't want to turn that feature on or off depending on the game I'm about to play, because I'd just forget and then eventually just disable it, or sell my phone if I couldn't configure it.