In LiveCode Script mode, the autocomplete settings don't result in useful suggestions.

In LiveCode Builder mode:

handler TestHandler()
    variable tTempVar

end handler

Put the cursor on the blank line and type tte. The first suggestion is tTempVar.

In LiveCode Script mode:

on mouseUp
   local tTempVar

end mouseUp

Put the cursor on the blank line and type tte. The first suggestion is templateEPS and tTempVar doesn't appear anywhere in the suggested completions.