Dumb Finale Thing
Just in case you were wondering (Hey, Google-bot) how to do the time signature 3/8+3/4 in Finale and not have it beam all screwy, here's what you do.
Go into the time signature tool, choose composite. In the first box on the top row, type the number 0.75. In the box below it, type the number 2. Now, you're thinking, this is insane, there's no such thing as .75/2 time. And you're right. But strangely, this will make Finale think it's 3/8. Now in the next pair of boxes, type 3 and 4. Say okay.
Then, once you get to the main time signature screen, choose 'more options' and "Different time signature for display" because clearly, if you give a player something with . 75/2 on it, they're going to have a heart attack. So then type in 3, 8, 3, 4 in the boxes and you're good to go.
Incidentally, if you're having trouble with the Finale Tempo Tool, the reason is that it doesn't work. Really. That's what the rep told us. Just use the "Expression" Tool.