Modifying these are very simple, expecailly since they used arcade parts. I own a few of the arcade games and the first thing I do iss replace the controls when I pickup a new game. So don't be intimidated and it is a lot easier then you would think. All the wires on TE stick have spade connectros, so that makes for easy swapping.
I am going to make mine wireless. I already obtained an old PS3 controller to steal the board from and am ordering the Toodles Axisdapter Board. Then it will be just a matter of when I can get around to it. I sit very far away from my PS3 and am not looking forward to running a long USB cable, especially with 3 dogs. I really wish it would have been wireless from the beginning and I would have paid more for that if it was an option.