Keyboard simulation within a userspace component

I am trying to create a custom keypad using an arduino to matrix the 130 key membrane keypad. I got the arduino side done sending each key as a code via serial. I plan to use the component that ArcEye created a while back as a base. I think I have all the pins figured as hal pins but I want the standard keyboard part to work as an actual keyboard for input. Is the a way in the .comp file to send a keystroke like if it was a real keyboard? Also if there is how would I handle "shift" commands? I can manage the shift key on the arduino side and just give every uppercase key a different key code.

Why not go with USB ?

Free USB Stack, one I've used myself, www.fourwalledcubicle.com/LUFA.php

Did you happen to have any more information on your previous use? Not against using another method. I really want hal pins from all the keys other than the actual keyboard and number pad. Maybe this can be done in python?

Here is what I am working with...

Best idea would be to look at the LUFA frame work, you maybe able to create a composite device eg Keyboard & joystick, Keyboard would be handled as per normal, and use hal_input for joysyick side.
linuxcnc.org/docs/2.7/html/man/man1/hal_input.1.html

There is also this:
generichid.sourceforge.net/
Makefile needs a bit of faffing around with, nothing too serious.

The code I wrote is for a joystick device,pretty much just extending the lufa example, it appears as a standard joystick, I used the hidcomp component from franksworkshop. I used a Arduino micro, but I have a Teensy floating around as I want a more complete panel.
I'd have to fire up the old Thinkpad & Beaglebone to look at the code but it's pretty boiler plate.

I just had a thought, maybe there is a python library or code example you could use to send key events.

I found this, haven't given it a try, not too sure if it can be used at all.
github.com/boppreh/keyboard

Maybe this python code would work?
pythonfiddle.com/usb-keyboard-emulator/

Ok what you maybe able to do is use uinput.

robocup.wtb.tue.nl/svn/techunited/trunk/...nput%20subsystem.pdf