Support/Sightstone fix; Passive Xp`when near higher leveled ally.
What if we put that old mastery as a passive on sightsone and it's upgrades? Would reward roaming more and make you feel less weak all game long. Which is part of why noone likes Support. Being 2-3 levels behind everyone makes you such a liability.
It leaves early game roughly the same, and starts to kick in when grouping. It will help out supports not getting shredded instantly by a randomly fed mid or toplaner due to some passive stats. Which tends to happen in tiers below diamond.
And it can't be abused by the likes of Lee Sin or whatever, because solo-laners have the highest levels anyways.