It was always something that I said the game needed. Alot of gamers get overwhelmed when playing a game for the first time and it often then leaves a negative impact on their overall enjoyment. The best games you can simply just pick up and play without for the need of a huge tutorial system or a 200page manual.
As well as doing PR, I also write for a few publications and websites, reviewing games etc. 9/10 review samples that I receive don't have instruction booklets, kind of annoying at times but it makes you just pick the game up and learn its intricacies!
Regarding the covert mission, we were just seeing how interested people would be doing a mission of that style. We like to interact with our audience as much as possible and get them involved with the creation process.
Cheat codes and unlockables, I know this is something we've done in the past with other titles. If I'm 100% honest, I don't know whether Pearl Harbor Red Sun Rising has any; I'll find out!