That sounds like a good setting to add, alike reactions where you can finely choose to make them auto or not.
I actually don't think it would be a good setting, for a very specific reason; the change isn't applied universally. As has been pointed out, numerous spells that have you choose targets still let you choose them freely. So the only way for a player to know what spells the change does and doesn't apply to ahead of time would be to list out the spells in the setting option, which would be a pretty dumb thing since no one could reasonably be expected to read it. And if they changed the way it works for any single spell, that means someone would have to go and either add or remove it from the list, which is tedious on their part. Unless they're doing something as blanket as having all control spells that let you choose targets be AoE instead. And if that were the case that seems like a dumb decision because surely that change could not possibly benefit every control spell of that nature, just like surely there would be attack spells that WOULD benefit from whatever click-saving ethos they're arbitrarily implementing. And in my opinion it would only serve as further evidence that any sort of click-time argument is just a veil over their real intent of making control spells less valuable and useful.
