I checked out your server. There were some really nice buildings on it. I wonder if it makes sense to open up your mumble server to other Minetest servers. You could create rooms for them with their server names or let them create their own sub rooms? Just a thought because if you name the Mumble server Sakel World, it might be good advertising for your server. I don't have a server myself, but it might be nice to have a Minetest Mumble server out there where everyone can hang out.