Haven’t found anywhere discussing ideas for this so I thought we could put all our ideas in one place.
Teleporting to friends
I’m pretty sure you are going to have a portal, so there isn’t really a need. It would decrease game time also, so it isn’t as good as you think it would be. But idk
Teleporting, afaik, won’t be a feature in the final game - it’s just for ease of use in the development cycle. To my knowledge, this is what warp stone will be used for (when it’s implemented).
You create an initial portal (which will not be active), you then travel to wherever you want to place your connecting portal and place it. The 2 portals become linked … hey presto! That pretty much covers all your points (you just have to do the leg work first!) 
That sounds pretty solid.
would like the thing of teleport to “X” friend position and other “X” location where placed a secret beacon, and having a little menu with a list of memorized locations somehow
That’s kinda what I was thinking, but I’d like to see what they are coming up with. It sounds intriguing.
if there is a way for simple teleoporting without the need of making a portal first it should be mat consuming or havng a high cost of currency … Possible, but not for being overused (and a cooldown sucks in a game where you have the possibility to link everything to crafting costs )