Enigmus is right about that. A competition shouldn't be limiting the composers to what the judges' software can or cannot play. As long as the composers know what those effects sound like, and the judges as well (or they should, anyway), then they should be acceptable, even if the software can't play them back. The only thing you can get out of a midi anyway is a basic feeling of harmony, it doesn't have anything to do with real sound, real dynamics, real tempi, real accents, real silences or reality at all. In midi I could have a flute player change into a piccolo in 1/3rd of a second, but in real life that can't happen.
So, I believe the players should be free to use any kind of notation they want, as long as it is publishable in PDF (either scanned or printed from a notational program in a PDF file).
Also, maybe for the conveniency of the judges (if you want to), we can ask for the composers to describe the effects of any notation that can't be played back properly on finale, because if they can't describe it, then there's little point in using it

That would make it more challenging
