Hi KevinH,
Many thanks for that info.
So for now, I need to use the plugin menu to activate the plugin. And at some point in the future buttons will be possible. That sounds very good to me.
I not only use the flightcrew plugin, but also the sigil sanitycheck and the epubcheck plugin. Additionally I use the check of the calibre editor. And recently (a week), the preview. Experience has taught me that doing it this way works very well for me without having to understand every single detail and without having to be a programmer. And it seems to cover most mistakes that may be present in the epub.
