Back when I developed Lemon I actually generated the table of contents
myself (line 31+), but I'm assuming that's not something you would want to do? It would be specific only to the MOBI writer then. I can fully understand if you don't want to do that.
Edit: I think you are actually doing that already with the "include_tocpage" option, I just need a way to somehow disable the "official table of contents" generation now...