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Three pedal one here. Bought by accident but now happily use it with middle one to switch modes using Karabiner and outer two either Cmd/Mouseclick or pgup/down, left/right, scroll, space left/right etc.

I use the 3 pedal foot switch. Left pedal is escape. Right pedal is move to the end of a line in vim. Haven't decided what to do with the middle one yet.

someone made an arcade button mod, positioned on the wrist rest, to function as extra buttons acting as the foot pedals. might be an interesting way to go instead of having to have another peripheral device.