It doesn't seem to be possible to generate all-caps keywalks.
Here is an example:
caps.base:
6.route:
en.keymap is original file
$ kwp caps.base en.keymap 6.route
Output is empty, as expected.
$ kwp caps.base en.keymap 6.route -s1
Qwertyu
Asdfghj
Zxcvbnm
QWERTYU
ASDFGHJ
ZXCVBNM
$ kwp caps.base en.keymap 6.route -s1 -b0
Output is empty again. It would be nice to see following output here
I'm using precompiled kwp release 1.00