Multiple Pally aura switcher?
 

I remember hearing a long time ago about something you could use with a paladin that would constantly scroll through whichever auras you wanted to use while you played. In effect, this would make it so you actually have more than one aura on a hand, enabling you to use a combat skill at the same time.

Did these ever exist? And if so, what happened to them?

i think our talking about autoskills or something, a d2hackit module made a long time ago