When working with multiple databases across different servers and environments it's easy to make mistakes, so i would like to have an option to show warnings when working with a production server and also highlighting in some way that I am currently connected to a production server. Some similar feature is present in almost all of the standalone tools which manage mysql databases.
Isn't this already there?

I use green for sandbox and development servers and red for production.
Also I recommend creating a second user for yourself on the production server which cannot drop or delete. That you can mark with yellow.
@penCsharpener Thanks for the tip, i was looking for something like this. I would include this option inside the Session Manager > Settings also.
Yes, this is definitely reasonable.
I just moved the color setting to the Advanced tab:

That background color selector now additionally shows all colors you defined for any of your sessions:

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Yes, this is definitely reasonable.