1) A greater range of genres. This can help people find a specific kind of comic they're looking for. It can also be quite hard for creators to pick a genre from the list but the comic doesn't quite fit any of them so they pick the closest. Particular genres I'd like to see are psychological, supernatural, adventure, gag a day, thriller, and there's probably more.
2) Chapter/episode folders. Especially on desktop, the scrollbar gets really small and get really hard to use after 80 episodes and scrolling becomes too much. When you're not logged in, it's quite difficult to get back to where you left off.
3) Better tag system. I was hoping that the tag system would work like tumblr or twitter.