When loading pictures I often wonder if ristretto actually received my click-event . My pictures are on the network so loading 12MP pictures from a network source takes a while so if you could somehow implement a 'progress bar' kind of thing that would be very neat.
Progress is dificult, since I have no way of knowing how many files you are going to load until they are all loaded. But, a 'busy'-indicator should be possible.
It's not fancy, but the progressbar says it's loading when it is loading.