Originally Posted by FrozenInferno
To clarify, there's no way for Calibre to detect whether a document already has a TOC during conversion and disable the TOC function for that document if it does?
If so, do you think something like this would be difficult to implement?
This sounds like a potential candidate for the Quality Check plugin, you might want to ask over in that plugin thread if this is something kiwidude might consider adding.
I'm not sure what the plugin would need to look for though, maybe a <guide> element?