League-of-legends – Target Priority for Turrets

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.

It is very hard to create a solution to this problem 100% of the time, but there are some tips I can give.

1. For your scenario specifically if you find that you aren't able to farm to well then consider some mana regen seals so you can make better use of your abilities to last hit those minions.

2. Early laning is all about holding your tower over everything else. If you can't effectivley harass your oponent then don't. Let him come to you and ask for a gank. If the issue is that he is farming to well then he most likely pretty over-extended asking to be ganked. However, holding your tower in good standing and making sure you don't get underleveled are more important than harassing the enemy. You will have all game to outplay him, let him have his early game glory.

3. Consider who is going to be in what lane when you are chosing your lanes. A lot of champions can sustain better than Ryze against Brand, but in general Brand will always be a pain early game. Cait, Akali and even if you're feeling daring Morde in mid are good counters to Brands mid game.

4. Also instead of putting your focus in harassing Brand put your focus on avoiding his harassing. Last hit minions as best as you can and keep your movements frequent and sporadic. A lot of Brands moves are skillshots and are very easy to avoid.