When performing remote work on client computers there are times when the blank screen is very useful however that typically means the client doesn't know what is going on. Many times I have been disconnected because they see a blank screen, no mouse or keyboard (because it is frozen from my end) and so they simply restart the computer. If there were a 'maintenance is currently being performed" styled background that could be created by the admin instead of the blank screen would solve a lot of problems.