Xmodmap would be fluffy cake to use.

Move xmodmap to
/usr/bin/

chmod +x /usr/bin/xmodmap

Create a file so that you see
/home/user/.Xmodmap

That file should have in it something like
keysym F7 = TAB TAB TAB TAB

To run it, type in Xterm
xmodmap ./.Xmodmap

To stop it, type in Xterm
setxkbmap

Sorry I don't have something simple for you to just copy and paste in Xterm but I'm pretty poor with the command line.

Anyway, pressing the ZOOM IN key on top of your tablet will produce a Tabbing effect.

Still looking at a solution for you though.

This was the best post I found online.
http://www.gossamer-threads.com/list...velopers/26609

Basically the keyboard is closed source. The only way to hack it is through reverse engineering.

And the .vkb file doesn't have any codes in it for the Return, Backspace or Tab key.

It might be located in
/usr/share/X11/xkb/geometry
but I'm not sure.

Anyway, this ended up being a little beyond me so I don't think I can help you on this anymore.

Oh well.