TK17 was specifically programmed to be moddable though, and to an extent, so was 3DSV (More for paid mods/DLCs). Unity is weird when it comes to adding poses to, as I've said, because in this case, we'd have to alter the UI/Menu to include such a pose, and we'd have to somehow compile a list of poses to add, without completely overwriting things and making other modded poses disappear, which again, is difficult. You're essentially making a whole new directory in an engine that's finicky AF when it comes to resource folders. So yes, it is possible. Maybe we could find a way to use the Plugins folder, but ultimately, it's a whole lot of effort, like a team effort, for such a small result. It'd probably take months to get it work on a Vanilla install, and possibly longer to get it to work with other UI mods.