After a year of absolutely no news or anything, the Teleporter STool has been updated. Here are the changes that have been brought about by this update:

-Entirely recoded from scratch. Should be more stable now.
-Teleporters now search for entities in a radius around them, which can be changed in the STool itself. It's displayed graphically by a green sphere around the teleporter. This can be toggled on and off.
-Beam appearance has been changed so it doesn't look as horrible.
-Props, contraptions, and SENTs can now be teleported. Contraption teleporting is still kind of flaky until next update when I can actually figure out how to make the teleporters change the teleported ents' velocities based on its orientation.
-Many, many bugs fixed. Understatement.
-Teleporters now reference each other properly in dupes, so they will never become scrambled if you dupe in two on the same numpad set.
-Wire inputs to teleport and lock the teleporter. Doesn't dupe properly for some reason, but it works.

Future plans:

-Fix wire inputs not duping.
-Make teleporting contraptions not terrible.

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Facepunch Thread: http://www.facepunch.com/showthread.php?p=19777570

Version 2.1