Hi there, you are suffering the same as I was after dis-appointing attempts at keyboard hacking so I finally made a plug-and-play switch interface. I don't like having to keep adding bits and pieces even though I can write a bit of code, I just wanted to add switches and go.
I have made a few extra and made them available on ebay at:
http://www.ebay.fr/itm/PS-2-peripheriques-de-ordinateur-Flight-Sim-/301988077362?hash=item464fe45f32:g:ZDwAAOSwMNxXYXCK
Upto 128 sequences in 4 Banks of 32 momentary or toggle operations are available.
Being truely P&P does mean that you are stuck with my selection but if you talk to me nicely then I might be able to do something about that.
Good luck which ever way you decide to go.