Hi Ernst,
Not sure if this will work - I'm currently on holiday so I cannot check myself.
It looks like the RadioSync settings are stored in an %appdata% Local folder (if you're on Windows), e.g. C:\Users\<your user name>\AppData\Local\Expert Electronics\RadioSync
The name of the settings file is settings.json.
So, if you configure RadioSync once and save that settings file somewhere else, maybe under a different name, then reconfigure and save again under yet a different name you could make a little batch file that copies either of the two different settings file back to settings.json in the AppData folder, and then starts RadioSync you might be able to get what you want to achieve. However, there's a settings.json.md5, too, so it might become necessary to copy/restore that file (better say its two versions) along with the .json files.
Or, simply copy / copy back the entire RadioSync folder. This might be the easiest way.
It's just a guess...
Best 73
Eberhard, DK8JV