A GUI mod should not change the way the game works underneath, only the way you graphically interface with it.
Yes, but you are forgetting that the spirit of competition drives one player to be better than another and that as a direct result, players with high APM do better than players that cannot keep up. This is inescapable. Automation generally is not the solution because it just decreases the number of actions a player can do, which flattens the learning curve. Instead, the ways in which an action can be better than another action, strategic options, should be increased. This allows one players fewer, smarter actions to have more of an impact.
I'm trying to help with this last part