Thanks for the reply on the IK info. I come from a 3D background and was leaning on some assumptions from there.
A new issue I'm having is the exporter is cutting off animation frames when a single image dimension is over a certain (admittedly large) size. The bug starts when the width is past roughly 32000 px. Bumped into this bug creating 16x1 animation strips (That photoshop batches into evenly spaced square power of two texture sheets). Understandable when working at those sizes if there are software limitations in the exporter, but a warning in the exporter that the file will get cropped would be nifty. I'm exporting at 100% since I prefer to have photoshop's sampling options for downscaling as part of the batching process. I have a work around for the issue so it's not pressing, just wanted to bring it to your attention if it wasn't a known issue.
Really enjoying Spriter, especially the Character Maps, which have allowed me to painlessly reskin animations in very useful ways. Can't wait for mesh distortion to become a supported feature!