I know this has been discussed before, but it has been closed and nothing being done about it. Still many people have asked for a feature where you can join multiple servers in one Mumble instance.
I give you an example of the possible scenario where this is very usefull. I use TS atm (and we are moving to Mumble) in my WoW guild. We speak english there and at the same time I use separate Ventrilo instance and keybinding to talk with my friends in finnish. There is no need for my guild or my friends to hear eachother or me talking to other group.
I bet I'm not only one doing this, so could you please consider adding this feature to Mumble? Another option might be ability to join multiple channels at same time and bind different keybinds to them.
I know this can be done so that one channel hears everything you say and other channel only the other keybind speak. There is however no point for example my friends to listen my WoW talk in another language and another game than they are playing.