May be i am a little bit crazy requesting this… 
. i hope there will be a lot helpful if we can get polarization filter effect in corona. sometime i want darker shadow, controlling reflection, high contrast and darker sky without altering the whole lighting and GI (ie. without tweaking the lighting and cheating the material). i believe this will be amazing feature in corona if we can get coz No other render engine support this feature currently right now (i think…).
sorry, this feature is too off our course right now, that it is unrealistic to implement it