From my understanding, the rule is that key bindings must be 1:1. This means for every one physical action you take, like pressing a key, it must do exactly one in game action. Double clicking fundamentally means you must physically click the mouse twice to do it normally. As such, scrolling the mouse wheel, one physical action, causing your character in game to double click, two in game actions, is 1:2 and therefore against the rules. This is what I gathered from a shoutbox clarification on the matter a few days ago. @Tim Seems like a clear cut rule explanation would be helpful, considering there's at least three people I'm aware of who are unsure what the legitimate methods to drop mesos as shadowers are.
