Oh, sweet! Take all the time you need :D
For the request: It seems like everything I read about appendages, they only work left-to-right, like the tail in the demo model where the base of the tail needs to be on the left and the part that wags is on the right; I could be mistaken about that though. The request is asking if it's possible to have top-to-bottom, bottom-to-top, and right-to-left options, if that's not already a feature. Like, being able to choose where the base of the appendage is when adding it as a layer instead of being locked to keeping moving appendages on the right.