Version:           0.10.0 (using KDE 4.2.96)
OS:                Linux
Installed from:    SuSE RPMs

Rating is possible by using the five stars - that are just 5 rating levels. That's not always enough. but what is more important:
Often, I need to rate two things: the quality on the technical side and the quality on the subject side.
E.g. I have a picture that shows something very precious to me, but is an old picture with poor colours, scratches on it and so on, I would rate it low on technical quality, but high on motive quality, because the motive is important to me.
It would be nice to have two rating categories, because then there are better ways of finding certain pictures.