Quote from gundamgundam
To be honest with you, instead of adding something to the already broken "Anime Start/End Chapter", I wish it was replaced with something like "Anime/Live action/novel/videogame relationship" or something, where you can explain what relationship the anime/live action/novel/videogame has with the manga, if it's a faithful adaptation, you can put it like in the present "Anime Start/End Chapter", if it's a different continuity, prequel, sequel, side story or the like, you can also put it there. That to me would be a far better option.
Quote from lynira
However, if this suggestion is implemented, I'd rather it not take up too much extra space, so I agree with what lys said ("Maybe it could just be incorporated into the existing section, so an "Anime/Drama Start/End chapter" box? Just so it doesn't take up more space on the series info page...").
"I'll shut your mouth~~~~~ with mine~~~"