I see it mentioned on the TLW page ('works in conjunction with Altima teleport hack') and a few other places but I was wondering what it is exactly?
Thanks..
Oh, that's what that is.
If it's tied to the Altima teleport effects, it's a hack that isn't around anymore because the functionality was moved to the Patcher. It allowed ability effects to be given to abilities that don't use spell effects like Jump and the Math skills. (The Math skills ended up being the ones to use; it broke Jump.) This allowed the Altima teleports to be told to use those abilities instead of needing entire ability slots to be wasted just on special non-ability effects.
Honestly, if you're looking for a hack that isn't readily available, it's generally not going to be worth your time. It'll fall into one of three categories: an interesting idea that never worked without serious issues in practice, something made obsolete due to other work since then, or something big that's part of a specific mod and is full of dependencies. And considering how all of the above are readily available, that really says something. Best not to worry about chasing something just from the name when you don't even know what it did.