In case it was missed (1327) i would like to propose again to add an option for "External flash mode". Since the Exp.Sim cannot be turned off, this would be a very valid way to work with studio flashes in manual mode. I've seen it implemented in breeze sys photobooth. http://www.breezesys.com/articles/photobooth5.htm That would be a very welcome addition.
Issue #1359 wontfix