I don't know how you'd do that.  I know that I'm on FiOS and I always seem to be about 10-20 seconds behind others in the GDTs.

Programming it would be rather simple.   Just don't display any posts until they are a 60 seconds old or whatever the user chooses.   It would be up the forum software developers to see enough need to implement it.  As a side benefit, you could also put it on a 3 hour delay when watching a recorded game.  Although if you started replying to posts at that point, it would get a little weird!  Posting on a 60 second buffer delay wouldn't be much of an issue though.