Could you add an option that creates a toolbar button to manually enable this in a post? Basically, if the addon sees bbcode like [CONTENTS][/CONTENTS] it renders the table of contents in the thread, otherwise its hidden.
I don't want it to automatically appear for every post that happens to use headings.
Also an option to disable automatically added numbers to the beginning of catalog items would be cool. I'm manually disabling it now via template edit.