I agree. Double clicking and drag clicking needs to get banned or at least severely nerfed via right click CPS limit. It gets frustrating when you are about to win the fight and suddenly your opponent drags or double clicks on you to stall by building stairs or to block off a pathway almost instantly, it's so unnatural.
Like what you said, most players use drag clicking or double clicking as an excuse for when they are actually auto clicking. Banning or nerfing drag and double clicking will make the games fair again.
There have been multiple suggestions in the past year to ban drag clicking and double clicking and while the majority of the community agree with the idea, CubeCraft hasn't taken any action against those clicking methods and I really hope they do something about it.