League of Legends – Do Minions Benefit from the Mountain Drake Buff?

There is a hotkey H which is the equivalent of toggling "Stop", which stops your current action. I'm not sure whether this will do what you need in stopping the auto-attack, but it's worth a try. I don't see any other options that could remotely do what you desire, other than getting stunned.

Continually pacing back and forth within range is a preferable course of action once you learn how to do it without getting exhausted. This actually has a few benefits besides just preventing you from attacking - it makes you a harder target, and it also makes it less detectable to be seen creeping closer and closer towards your opponent to make a pot shot. Alternatively, it makes your opponent uneasy since you can easily be in range to take said shot, which makes them less inclined to stay close.

If you take a look at this thread on the LoL page they discuss this matter. It would appear that yes it does affect minion and jungle attack speed. Also, if you look at the description of the Unique on Frozen Heart it says "Unique: Nearby enemies suffer −20% attack speed. (1000 range)" Any item that only effects Champions will say it specifically such as Aegis of the Legion.

Aegis of the Legion actually used to affect minions, but they removed that because it was kind of OP. Think about Yorick's minions with the Aegis buff! Terrifying.