Here are some things that you should keep in mind, in case you were wondering.

• Custom settings can be applied to any number of forms, there are no limits.
• Custom settings (same or different ones) can be applied to several forms on the same page, there will be no conflict.
• Once settings are applied to forms, if you modify them in the dashboard the modifications instantly apply to all forms using them, no need to do anything else.
• If you ever uninstall this package while some of your Express forms are using custom settings, nothing will break. The forms will simply revert to sitewide settings.