Well, at the risk of offending people by reviving an ancient thread...I'm back, and resuming work on this mod again, believe it or not. As a matter of fact, I just came up with what I think is a good idea for a conjectural second Maya UU...
A (probably long) while back I was reading some forum thread or other on a topic similar to this which posed the question: What if someone (the Maya being debatably the best candidate for this thanks to the UU they already have) had continued developing the technology behind the atl-atl similar to how the bow had evolved? The idea I came up with was sort of an inverse crossbow, that I've tentatively dubbed the Lancethrower: Take your standard atl-atl, extend both it and the javelin a bit (and tip the javelin with steel, of course, since your smiths have figured out how to make it by then), and add a crossbow-style cable and trigger but backward - thus the technique would be basically identical to the oldskool atl-atl but with the trigger being pulled at the release point, generating extra velocity and thus penetration. Thoughts?