Definitely the neck and hand tracking on your examples would benefit greatly from those extra tracking points. If I had more time I would have thrown them in there myself since I was doing actions on closed and lasso hands and without the animation looked a bit strange.
Also just read your updated docs for 1.1, the new hand state as execution is very handy, saves having multiple if statements in there. Also quick note, it seems you have it in the documentation twice. Once above and once below the old version.
A question you may be able to answer on. The tracked body ID, seems to be a bit random as to what 1 it assigns, I haven’t investigated too much but I would often get assigned an ID for a few hours and later, whatever conditions have changed, I get a different 1. So even with only 1 tracked body I would often get body ID 4 or 5.