[BRLTTY] Custom key bindings

[Sébastien Hinderer]

Hello Vincent,

It is okay to put rockers.kti directly under /etc/xdg/brltty. That's
what I am doing myself and I can report this works and I think it
already did with brltty 5.6.

So, for sure, there is no need to create other directories.

Beyond that I don't know, sorry. Depending on how brave you are, you may
try running brltty manually so increase its logging level, so that you
can figure out which files it reads. You could also achieve the same by
using strace.

Sébastien.