Maintenance mode for a single device is required so that it can be enabled while the tech support is doing troubleshooting.
We have monitors attached to the devices and if we do not have maintenance mode then it interferes with the maintenance tasks.
Currently the only way of enabling maintenance mode is to create a profie, add a maintenance window and then assign it to device. This is a lengthy procedure for adhoc tasks like working on a single device.
It will be good if its added at the main panel as shown in the attached image.