I personally would be happy with 5 small stars plus one mark for the label, or to save space on the bar select each separately so only one need be there if that is all you use. The values could be set with hot keys. However, users who want to do everything with the mouse may prefer clickable buttons. The advantage may become less as wide screen monitors are used more as the information space would be unused in that case(if the image hight was kept to the screen hight) However with a standard monitor I can see a bigger picture without it.
I personally would be happy
I personally would be happy with 5 small stars plus one mark for the label, or to save space on the bar select each separately so only one need be there if that is all you use. The values could be set with hot keys. However, users who want to do everything with the mouse may prefer clickable buttons. The advantage may become less as wide screen monitors are used more as the information space would be unused in that case(if the image hight was kept to the screen hight) However with a standard monitor I can see a bigger picture without it.