May I ask for an improvement to this dialog? It would be very useful if it also covered displays. Not all computers send a XF86display event when a display is connected or disconnected, so this might be an excellent opportunity to add a checkbox to spawn 'xfce4-display-settings --minimal' when a display is connected. Additionally, many people use extra commands to set up various things related to their display, so an additional "Automatically run a program when a display is connected" option would also be very very useful.
There is already an option in the display dialog to open the minimal dialog when a new display is connected. And finally, I really don't think an option to run a programme when a display is connected would go into that dialog (well, that is, unless we rename and rebrand it totally).
Setting it to fixed, as the desired option is already in another place.