[rt-users] Autocomplete vs. Drop-down for 'Owner'

[Jeff Blaine]

RT 4.2.11

I'm failing to find where in the code this "50 privileged users = use
autocompleter" logic is.

Where can I override this so that the drop-down remains in place? I
don't see that "50" token anywhere with a conditional around it.

Our value for $AutocompleteOwners is the default, 0, meaning "use the
drop down until 50 exist"

We want our 51-60 users to have the drop down always.

Someone point me in the right direction in the code, please?