CoolReader allows at leats three types of "bookmarks": comments, corrections and page bookmarks, and they are shown mixed in a bookmarks list. When you have a lot of bookmarks of different types, it coul be difficult to look for your last comment, correction or page bookmark, as they are show in a single list, and ypu will have to browse the list page looking for a particular bookmark.
I think it will a good enhancement that the bookmark show foru pages, one mixing every type of bookmark, one for comments (thah i use to use as simple highlights), one for corrections and one for page bookmarks.
CoolReader deserves that COOL in it name. Thanks for this great sofware