Hi Debra,
I personally think that is a great idea; but, though I like it and you seem to like it too, if you decide to do it, I doubt that it would affect your score in a positive way.
From what I can gather, the evaluation is based upon correctness of the design, consistency of the approach, and simplicity: of course, it must also work and fulfill the specified requirements.
Additional fuctionality is a grey area...but, remember that the program must not be too complicated due to the requirement that junior programmers will be maintaining it.
Another grey area, junior programmers can be quite talented...
So, I guess if server push is not too complex, and your design is built with this in mind, it probably will not hurt; but, if you are doing it to get a higher score, I think your time would be waisted.
my $.02 worth...
-Richard