y and z are wrong. i once fixed a file that made me able to press z to sleep instead of y. it had some codes and stuff.
i am on a new pc and this one has it wrong again. its a minor fix. http://www.unrealsoftware.de/files_show.php?file=14352
Keymapping is something you can change on your operation system. Otherwise the game itself lets you change the Sleep, Diary, ... keys in the Options menu. So for me, your question is wrong.
I blame Blitz3D for this. I assume that it uses the keyboard layout of the system which was used for compiling the game and it doesn't care about the keyboard layout of the PC which is used to actually run the game. This is not my fault and I actually can't even fix it because Blitz3D does not provide the required functionality (at least not out of the box). Sorry for the inconvenience.