You might want to consider using colours to identify your users. In that case the connection information will be shown in the colour you picked for that connection (user interface, appearance), still below the window. I am using the new version for more than 2 months now and got used to the differences after about a week, but I am using the tool only since version 5.
If you do not want all window connections to start when opening the Developer you need to stop using "autosave desktop" in user interface, options. Disadvantage will be that your windows do not open at the start. Alternatively you could "crash" your application, it will then open with all windows but with only the one connection you chose at the start.
I also would prefer to use autosave desktop without opening all window connections. It looks like a waste of resources to me.