Hello,
Since minetest world can become huge, it would be nice to be able to craft some kind of home teleportation device. It would be made out of rare materials. Stacking certain blocks in a certain order would for example create the teleportation gate. Then you would craft a handheld teleportation device to trigger the teleport. This way you can put a gate in your home, go on a mining trip all the way down, and teleport back.
Additionally, teleport gates (like stargates) should be made to travel from town to town. Players should be able to put them anywhere but they should require a lot of rare materials to make. Anyone can use them and they do not take up inventory space, unlike the home beacon+handheld device.
I think this feature is justified. All people do is build things. A stargate system would allow users to make their own travel hubs. It fits perfectly in the 'build your own game' that it is right now. Give players the gates, let them build the travel system.