Have you searched the finale manuals? I am sure there's something in there, and if there isn't, there is also a very good finale helpdesk on their website.
I don't have finale here, so I can't really tell, but a) what flint-wwrr said, and b) why do you care about playback? If you can play the piano, notate it as you wish and then record it yourself. Don't let finale get in the way of your compositions and let it dictate you how you write a piece
