Suggestion: how to push lux out of support role
Give her passive a tiny AoE on her passive (about size of Zoe Q's AoE) so that she can waveclear better. It wont make her capable of viktor level of waveclear, but it would help her waveclear go on par with other mages such as veigar, zoe, cassiopeia, and ziggs on waveclear. Bonus points if her passive induces crit for the crit animation.
And compensation-nerf for that buff by nerfing E base damage. If lux can have a source of waveclear aside from E, then her E base damage wouldn't have to be as powerful. With reduced base damage on E, she would be less attractive for support role since her support laning power comes mostly from E poke damage.
EDIT: i thought that even just a while ago most people were opposed to lux being viable at support role. It appears im wrong about that