User blog comment:Supp0rt4n00bz/What if summoner spells can be changed in-game?/@comment-5266525-20130827170458/@comment-8802138-20130828143558

Junglers could exchange Smite for Exhaust or something when there is not Baron fight time...

Supports could take Heal early and change it to Exhaust because of the lategame scaling.