What if you could set preset summoner spells for every role?
In the client settings menu, you should be able to set a summoner spell preset for every role, so that if you get sent to adc for example, it automatically gives you heal and flash. This would fix the problem of king let's forgetting to change smite and being fucked over as well as streamline the whole system as a whole without having riot accidentally setting flash to the wrong key or something.
Just to clarify, this would just be a preset, not you locking in your summoner spell. You can easily swap in game after just like on live. It would just set your summs depending on your role by default.