Sorry if this is out already but I did search around some earlier but didnt find anything, but just a few ideas about improving the captain logs. One thing I noticed what you log is restricted to location, torpedos left and when sinking ships or aircrafts. But to add to the realism we should have an option to manually log the captain files (along with the automated log input).
For example when we send a log we would have a dialog box to type additional "captains notes" like reporting damage, moderately/severe/fatal injuries of crewmen or anything else worth noting. Also we should have an option to export our logs or even have something like a community site similar to virtual airlines for flight simulator X (see example here :
http://www.simmiles.com/) they upload their logs from ingame to the server and all the information is displayed on the site and even have top captains or something like that, although im not sure something like this can be done since the limitations of the game coding but just an idea.