Is there a way to do this?

If not, please let me map a key to press that will trigger auto attack on the current target.

ATM I stand beside mob, then either activate/waste an ability on my bar to engage or use a blank space (waste of a slot) to tell the UI I want to attack.

EX I stand beside a mob, whether I am Passive or Active (this can be toggled in config to not occur from Passive,) I become Active stance and begin to melee.

If I could map this I would suggest the default (as it's where I would put it) as the "1" key on the numpad.

Thank you, take care.

P.S. if its a feature already then, someone please school me.