On the subject of different attacks purchased from guilds (e.g. Heavy Slash) while also introducing auto-attack, they could consider turning these actions into stances. For example, normally I would auto-attack with light swing. However, if a situation calls for me to use heavy swing, I could simply use the ability from my action bar and my character would enter that stance. Any following auto-attack after using the ability would result in heavy swing, and I could just as easily switch back to light swing if needed.

Just an idea. Personally, I'm rather indifferent to the idea of adding auto-attack. On the other hand, I was a fan of XI's battle system, so having AA added to the game wouldn't necessarily upset me.