Q: Where can I find scripts to use in Finale?
A: In the Repository (not yet available), you'll be able to download and automatically install script.
Q: Can a script be placed in Finale's plug-in menu?
A: Yes, scripts can appear in the same “Plug-ins” menu branch as JW Lua. Do like this:
Explorer tab in JW Lua[Menu] item in the top listNew… button in the bottom list