When you add a bookmark and you click the button that permits to select the right folder, it would be REALLY useful if you could type for example "xxxx" to restrict the range of selectable folders only to the ones whose name contain the string "xxxx"; this would make very easy to select the right folder without having to scroll between all of the folders
other mini suggestions:
if "xxxx" is a subfolder, it should be showed as "xxxx (parent folder)", "xxxx (grandparent folder/parent folder)" and so on
if there are two folders called "xxxx", they should be numbered e.g. "xxxx , xxxx ...."