First off, apologies if I'm doing anything wrong in my submission here; first post and all that.
Second, pretty simple suggestion: add a recipe for leather with UU matter. Nearly every other non-food natural item can be made using UU matter, with the exception of string, and it seems to me that UU matter was made in many ways so that you don't have to make farms for a lot of natural materials (reeds, vines, cactus, cocoa, etc). It would save a lot of time, effort, and frustration over glitchy SMP mobs.
Thanks for reading,
--DasZakhaev
P.S: As I mentioned, this is my first post. If I did anything that would cause frustration for anyone, let me know (politely!) so I can fix it ASAP. Not looking to make life hard for the moderators here; they work hard enough as it is.