Often I'm reading a bunch of comics parallel. I start a SciFi comic, then I feel more like reading comedy and start another one. I'm not satisfied with comedy comix no. 1, so I start reading another comedy comic.
Also there are weeks between when I last read a comic and than pick it up again.

It would be cool if it was being displayed in the left panel for the folder view when a series within a folder was last read.

Maybe also a way to mark folders individually. Maybe a set of 5 different folder icons one can choose from.
Like if you want to mark a folder with a heart because you really liked that comic. Or a star because you want to read a series next and so on.
Or just different folder colors.

EDIT: It seems this already has been adressed with the newest beta version. XD