Is your feature request related to a problem? Please describe.
No.

Describe the solution you'd like
When the plugin first gets data, it could auojoin the first fgcom-mumble channel it finds.
This way one would just need to connect to the mumble server, start flightgear and be ready.

Describe alternatives you've considered
Manual join.

Additional context
There is a mumble feature that joins the last open server automatically upon client start.
This may interfere with this feature.