custom characters or layouts in Hackers keyboard.

[Vladisß Pestrikoff]

The keyboard not beautiful, but good enough. But im need to make it more convenient.
In some layouts i can't find specials characters, and i would to slide up Esc button (why only it fall?)
How can i do it? Is there files for layouts? Like xml file to swith 'a' and 's'?
Thank u.