So I've been playing with this idea for awhile, modifying cheap manual flashes to work with Canon wireless flashes.
The main idea is to control the power output of flashes like Yongnuo either from in camera menu on capable bodies like 7D and 60D or master capable flashes like 580EX. This is limited to wireless manual mode only.
Now, I'm not a professional photographer and I don't have experience shooting in studio. For you guys that work with manual flashes all the time, do you think this is useful? What do you guys think?