Jonathan,
Make sure you download the Vienna Ensemble player. There also is a Finale 2010 file with VSL preferences to download. In Finale's midi setup window, under channels 1-16 load the Vienna Ensemble player. Then in the Ensemble player load your instruments into the player's 16 channels. Make sure in your file you have the VSL preferences chosen, not the default preferences. Then just start a test file with violins. The pizz and arco expressions you use should not have any playback definition assigned to them. Make sure your staff is labelled violin in staff attributes also. All of the articulation in the Special edition work automatically for me except the sforzato patch. That one needs to be triggered by a expression using a specified controller. Regular notes will default to the detache, slurred notes will switch to the legato patch. Long notes will be the sustained patch, pizz works with an expression and tremolo works via the tremolo articulation in Finale.
Good luck.