this link might be useful for -k key names
examples
gaming computer
sudo ./footswitch -3 -b mouse_left -2 -k up -1 -b mouse_right
older configurations
sudo ./footswitch -3 -k right -2 -k up -1 -k left
gaming computer
sudo ./footswitch -3 -b mouse_left -2 -k up -1 -b mouse_right
older configurations
sudo ./footswitch -3 -k right -2 -k up -1 -k left