Enven though it was supposed to be finished FoxBot has updates with support for the teleporter's and Steam.

Direct from there site

With Red's help I've managed to get the engineers to build teleporters, and everyone to use the teleporters if it saves them travel time to their goal. Waypointers will need to edit maps to add the appropriate waypoints for the engineers to build them at, but through my limited testing they do build and use them. Even so, I'm calling this a beta because I don't have enough time to thoroughly test it. I will however address any issues that come up and eventually add a version check if playing it with the old halflife proves problematic(see #1 below).

Download it here.

Couple other things...
1) There is a 2fort waypoint in the zip file with the dll. It's what I used for testing and has some teleporter waypoints set.
2) This build is primarily for the steam version, though I'd like it to be compatible with the old non-steam halflife so if someone could test that out for me please do and let me know. Specifically, try this build with the old halflife, with these waypoints that have teleporters. I think they might try to build them in the old halflife.