Dialog improvements

Dialogs are a great tools but as a server owner and programmer cool features could be added to them such as:

• Having a packet from the client sent to the server when a dialog is closed via ESC. I know that it could allow servers to force spam a dialog, but there is still a button to disconnect so a player could still disconnect from the server. It would allow servers to do actions on the escape such as opening the previous dialog, with ESC acting as a back action and would be better for UX than having always to click a cancel button.
• Single option inputs are nice but when you have a lot of option it can be not very user friendly. Even if if doesn't exist in the Minecraft UI right now, a dropdown input would be great (maybe as a variant of the single option) 
• Having buttons as an inputs (so without any payload content associated) could be nice to do sub-dialogs (for advanced configuration for example) wihout being forced of putting then at the bottom in a multi-action dialog

Thank you for your time and thanks for all the great technical work made in the background that is giving us better tools to build better servers and experiences!