mate its just a simple matter of emulating the way gayspy does it then redirecting either with the host file or through a patched exe. only problem may be that key auth may be slightly more difficult , but that could be fixed by generating unique keys based on system hardware. like punkbuster used to do until they realised how easy it was to tell it to fuck off 'im playing anyway' , ps my 'unique' guid on punkbuster was 'MRMEDICWASHERE' or 'MRMEDICSAYSBANTHIS' , think i still got a screenshot somewhere of one of them i will look.
yep here you go:
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