Except that it had a rudimentary option completion feature that was
sort of cool. When you typed "ls", for example, it would pop up a
window that would show you all the options that you could select for
that command. That was new and different. Too bad it didn't stick
around.
I remember reading about something like that, though it's not connected in my mind with A/UX. What I do remember is that you had to type "Ls" to pop up the options window: After all, most of the time you don't *want* options for "ls". On a text terminal, the top half of the screen became the options window; its scrolling content was restored when the window was dismissed.
The window had checkboxes corresponding to the options and text fields corresponding to their values, if any. I can't remember if it parsed the output of --help or equivalent, though. I also don't recall if such commands were supported in pipelines, though I see no reason why they should not have been.