hmm reading the posts, im gettin the idea some ppl dont know what auto attack really is...and jus going by the name..my experience from FFXI, an auto attack is pretty much the following: your character will auto attack(ONLY the BASIC attack), the speed/delay depends on you weapon, Dagger- fast and low dmg and low TP, while Great Axe- slow, high dmg, high tp. You can overwrite auto attack anytime by using any skills ur class has. If we take FFXIV into account, a Lancer would be doing Light Thrust on auto mode, but if u use Peirce or Full Thrust it would overwrie your automated light thrust and use the prompted move and after these moves are executed it would continue its auto attack.

If the auto attack were to be implemented, it should have a button to disable it any given time (for example sleep mob, or need of killing monster with weaponskills) and perform manual attack - Auto attack should not consume any stamina, but manual spam of basic attack + weapons skills should, also either slow stamina refill or increase cost of skills since auto attack does not consume stamina.
- if u have full stamina bar to spare and you have no TP, you can switch to manual mode and burn the stamina bar with manual spam to get quick TP thn chnage back to auto attack, this can save you in alot of fights where ur abt to die or something :P!