I was not sure where to post this, and I wasn't able to find anything about it. I want auto attack (under the options) to be uncheckable. As is, you can not un check it. It stays checked no matter how many times you click on it. Also, how do you train Subterfuge up while in offline mode?? I can't even get the first skill in that tree (Distract) to work!! I would have posted this as a possible bug/feedback, but there doesn't seem to be such an option for the offline version of the game, only the live server, on the forum.
I can definitely turn off auto-attack on my client. Maybe there's something amiss with your installation? You can also use T (I believe that's the default key) to toggle it on and off when you're in combat mode. Go to an Adventurer Trainer NPC and unlock the skill. It will cost you 100 gold. Then, use the skill near some NPCs to train it up a bit. I believe you only need to get it to 10 in order to unlock the skills under it.
I think you have to talk to an adventuring trainer and ask them to teach you advanced techniques first (or something like that) to unlock charged attacks.
And, FWIW, that is also super dumb. Especially since the toggle is visible in your options even before you unlock the ability.