Option to prevent champion to autoattack automatically (like pressing S)

Hi,

I was always bothered by the fact that champions autoattack automatically if left still, and to overcome that I am forced to continuously click to make the champion move (and keep changing where it moves, otherwise when he reaches the point he AAs). But lately I am noticing it far more because of the champions I am playing: Sona, Lux and Rumble. With Sona, sometimes it happens I want to put a ward down, and I'm not fast enough to issue a movement command after that: the passive get wasted on a minion. This kind of error puts me and my teammate in a bad spot as a big source of damage of sona not only gets wasted, but steals a creep from the ADC. Another example is when playing Lux: sometimes when I try to execute a full combo she AAs in the middle of the casting of E and Q, so I can no longer use the AA on the target of the abilities to trigger the passive.

Rumble is a bit different from this 2 different cases, as in that case I can not use S to prevent them from doing that, but anyway: with rumble i often find myself in the middle of the caster and melee opponent minions. In that case I never want to AA unless to last hit, but if I move 1) i go where I don't want to go 2) missclicking on a minion is really easy. In that cases S can help, but still..

And, as a reminder, I just want to make you notice that you had this problems with several kind of champions, the last one being gragas i think, that after an ability like W they automatically AA a minion wasting it. So it is actually a broader issue that you "fixed" for only a few abilities up to now.

TL;DR Please add an option in-game to make the champion AA only and only if they are told to do so. This option should be easily switchable like smartcast, so that I can use it only on the relevant champions. Using S isn't always an option (read above). The option doesn't influence in any way the people who are fine as it is right now if they don't want to use it.