My reply
Hi @Leviathan667,
I think this one should work for you, I tested it on my own DCS (beta) and it works with the 3-way flaps switch.
-- Spotlight
{down = iCommandPlane_SpotSelect_switch, up = iCommandPlane_SpotSelect_switch,value_down = 1.0, value_up = 0.0, name = _('MY_Spotlight Switch - LANDING'), category = {_('Systems')}},
{down = iCommandPlane_SpotSelect_switch, up = iCommandPlane_SpotSelect_switch,value_down = -1.0, value_up = 0.0,name = _('MY_Spotlight Switch - TAXI'), category = {_('Systems')}},