Hacking pads are not that difficult. You also have some other options. If you look in the consoles forum there are a number of threads about this. But here's the readers digest on options.
1) Hack your own pads (only do it with original pads or Madkatz pads). In the console forum there multiple links to tutorials, etc.
2) Buy hacked pads. HarumaN has a thread were he sells them. He does an amazing job and for the price you cant go wrong.
3) Buy the
XArcade BYOA Kit which will allow you to play more DC games and with the use of adapters allow you to also interface a PC or any other mainstream console (xbox, gamecube, PS1/PS2).
I have a couple of cabs with DC's in them. One is used for Vertical shmups and uses hacked madkatz pads and the other (horizontal) has the Xarcade kit for DC, MAME, and I' considering wedging in a modded Xbox.
Hope this helps,
-Goz