I've taken a look at the code of Additional Pipes, and it is hell. It's not worth maintaining or fixing it.
Plus, the author of that mod does not even understand the point of open source. Saying "It's My Stuff" on his page at code.google.com either means he's never done any real open source work, or is just plain stupid.
I do have plans on creating an equivalent implementation, as I'm heavily dependent on the teleport pipes. I have a floating island on my server, which houses my power plant and storage area. Some of my quarries are 5000 blocks away, and I can't afford to transport them that far.
I can't promise anything at the moment, since I'll be busy with a new project. Regardless, I really need them, so might as well make them.