Unfortunately this extension requires a specific Windows sig for every game. Would you be willing to take a different approach to achieve the same thing?
This method borrows gamedata from SDK Tools to hook AcceptInput for every point_*command entity that gets created:
http://pastebin.com/JWUAYWmh
I'm not sure yet if it'll require separate engine builds, but you wouldn't have to do much updating (if any) after the first release.
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