It would be really amazing if the input fields within custom dialogs gave us the ability to:
1. Display drop-down calendars.
2. Display pop-up menus.
3. Display pop-up lists.
4. Show more than 3 input fields.
Yes, we know that there are several plug-ins out there that already do this sort of thing, but it's always nice to have this advanced functionality built natively into FileMaker Pro itself... without needing to purchase, maintain, and update plug-ins.