At 13:43ish, Wayne is changing the bone roll for the palm bones by eye (and shortly after the finger bones. Is it possible to target them to a specific point, maybe to the 3d cursor for example depending where that's placed, so that they're all going to converge towards a central point?
Hmm, I might be! I'll have a look when I next jump on!
You can Recalculate to the cursor or maybe some other options could suit in different situations.
But that can take longer in some cases.
You can just roll the bone and point it where you need. The main thing I was "eye balling" was actually visualising with my mind all the palm bones bending slightly inward. I don't want to overdo it because the hands would shrink as they collapsed together. So I'm imagining how much each bone should roll as I'm doing that. It's not a centre convergence point but just a slight inward roll.