This app is Keyboard Layout for Jelly Bean(Android 4.1).
Keyboard Layout files are for Physical Keyboard.

This app provides following layouts.
- US Layout( caps->menu )
- US Layout( caps->ctrl/ctrl->menu )
- JP Layout( caps->menu )
- JP Layout( caps->ctrl/ctrl->menu )

Source code of this app is here.
http://code.google.com/p/jota-text-editor/source/browse/#svn%2Fkeyboardlayout

If you want more please let me know by mail.