Hi , Ctrl + F11 for screenshots . Dont press Shift + F11 what ever you do . The screenshots are kept in your main SH5 game folder usually in Drive:\Ubisoft\Silent Hunter 5
I just copy a shortcut to this to my desktop .
If you use TDW new UI mod you shouldnt need too many keys. Its mostly done via the interface .
http://www.subsim.com/radioroom/showthread.php?t=166093