This is my first time posting here, and I want to say this first: It's super cool that you guys take suggestions and feedback the way that you do. I submitted suggestions to MangaHere (I'm only there for the Tsukkomis at this point) a couple of times, and not only were they never implemented, but I had no way of knowing whether or not they were even seen. This thing you've got going on here is way better.
Anyway, I should probably get to my actual contribution to this suggestion thread. I think it'd be neat if there were a way to toggle Read/Unread on individual chapters in the Manga page. That way a user could go through and check off all of the chapters they've Read without having to mark all of them as Read.
Maybe this could be done by tweaking the functionality used to mark a chapter Unread when clicking on the eye symbol next to it?
I suggest this because the way I personally do things is I read a manga if it looks interesting, and if I like it I keep reading until I'm through all the chapters (unless it's exceptionally long). Only after I've read through what's available do I mark it as Reading (or, on other sites, Bookmark it). I figure that, if I do it that way, then there are probably some other users who behave similarly.
While being able to mark all as Read would be nice, sometimes I move on immediately after Following a manga, and don't return until something has updated. At that point, marking all as read would also mark the chapters I haven't read.
I'm realizing now as I type this that I could just mark them all as Read, and then remove the mark from the most recent chapters, so my point may very well be moot. I still think it'd be a nice feature to have though.
Thank you for coming to my TED talk.
Edit: Oh shit. After reading mixpe's post, I'm realizing that they have some really good points, too. I'd like to voice my support of those ideas as well.