Today I thought that maybe an extra feature (in addition to a reduced cooldown) Teleportation 2 could have without making it too overpowered is to allow the player to teleport back to the position they last teleported from. That way, you get a second teleport exit point, but it requires a bit of planning to use.
So to give an example, if my teleport destination is at home, and I am in the mine, I can click the existing teleport button to teleport back home. I enter my house and dump the ore on the floor. One of my teleport buttons would take me to my house (teleport point) and the other would take me to the mine (teleport back). Let's say I decide to take a break for a while and run off to the tool vendor to buy a new pick. After I'm finished purchasing, I teleport back to the mine, and my "teleport back" location is replaced with the tool vendor.
Clicking the teleport back button should display a message from our friend the rock until the user teleports for the first time.
It might be interesting. ^^