Itakari
You can already utilize the existing turbo setup for the exact same function you suggested. Just use any unused key (not tied to used hotkey or anything, I personally use my left TAB button) and set it to targetted turbo. This way you are able to AA/walk with just pressing the button and mouse hovering without clicking it.
Edit: I suggest using another key aside from TAB tho (an empty shortcut key is a good option), as it you need to turn off turbo everytime you need to use TAB making it a hassle. I am just too stubborn to switch to anything else.
