OK, I'm sorry. I was incorrectly working in Tasks, not Profiles. I should have known better.
Anyway ...
In Profiles, I select
Event.
Then I select
Plugin.
Then I select
AutoInput.
Then I select
UI Action.
Then, I get to a screen labeled
Event Edit upon which I can select
Configuration.
I select
Configuration, and the only items offered to me are
Action Types and
Element Text.
So, I select
Action Types.
Then, a menu comes up in which I can select
Clicks,
Long Clicks,
Input Element Focused, and
Input Element Focused Lost.
I first try
Long Clicks, but it just comes back with the
AutoInput UI Action menu, in which I can select either
Action Types or
Element Text.
I select
Action Types, but now I just get sent back to the same earlier menu in which I can select
Clicks,
Long Clicks,
Input Element Focused, and
Input Element Focused Lost.
Re-selecting
Long Clicks just repeats this.
And I tried
Clicks instead of
Long Clicks, but I still just get into the same state.
It seems like I can't ever use UI Action get to a screen which allows me to select back button or any other items.
So, instead of UI Action, I tried selecting Key after starting with AutoInput.
After that, I then can select Configuration, which brings me to a Key Event Options screen.
On that screen, I can select Keys, Key Action, and Manual Key Codes.
I select Keys, and then I select Back.
I then select Key Action, but all I'm offered is All, Key Down, and Key Up.
No long-press options are offered.