Single L/R Joycons default to unbound for the SL/SR inputs - so by default you can't progress past 'press L + R to continue' type screens.
But
* ConfigGamepadInputId.SingleLeftTrigger0(L)
* ConfigGamepadInputId.SingleRightTrigger0(L)
* ConfigGamepadInputId.SingleLeftTrigger1(R)
* ConfigGamepadInputId.SingleRightTrigger1(R)
already exist (and I verified these are the inputs triggered by the SL/SR buttons), so my change would default to these instead.