I've disabled auto completion of {} from the advanced settings menu, but the program still automatically adds a ] when I type [ in examples like:
\item[--]
Is this a bug or can I disable it some other way?
For the case you've given ] is inserted, because \item[text] is in the completer. Once you've typed \item[ this is the only possible choice in the completer. You may disable this by unchecking Configure -> Completion -> Autocomplete Common Prefix.
