Screen / Monitors preview (somewhat blurred) before initiating remote session
It would be helpful before we start remote session so we can see if user is busy/in a meeting/or not in front of the computer. Maybe very low quality image of current view of the screen with hard to read details so we are not intruding on their privacy.

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Mike Dacre commented
As well as making the check activity button next to the connect, I suggested/recommend but not yet up-voted, for a screen shot or verbage that can be written on a blank screen when connected to a client so that instead of just a blank screen, they know that maintenance is being done.. to eliminate them from pulling the plug while you are doing registry repairs, etc.
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Mike Dacre commented
If you are already connecting without first checking the activity of that computer then that is on you not the person you are connecting to...
If anything there should be a check activity button next to the connect (instead of having to click manage/user activity) which is time consuming -
atera atera commented
This is extremely helpful when needing to remoting into a client's PC.
I know Syncro, Pulseway and Kaseya definitely have this. I'm sure other RMM tools do as well.