That's extremely helpful, wilson. Thanks!
I would still say that the two Hemalurgical powers still missing are Feruchemical Temporal Powers and Feruchemical Enhancement powers. It seems like a logical extrapolation.
Two things I would note about the chart:
On the Physical and Mental metals, the metals which steal Allomantic or Feruchemical powers are the alloys. For Temporal and Enhancement, this is not true (though, with atium not actually being a real metal on the chart, I'm sure some things would fall into place better).
Also interesting is trying to predict which metal will have the Allomantic stealing for the quartet or the Feruchemical for the quartet (since these two are present in every quartet of metals). It's quite a difficult feat. I will still classify metals with the typical Allomantic External/Internal and Pushing/Pulling for convenience. It appears that a Hemalurgical power (say, Allomantic stealing) is not officially designated to a particular metal in a quartet. For example, Steel (External Pushing) steals Allomantic Powers, but Bronze (Internal Pushing) steals Allomantic Powers for the mental metals. There appears to be no correlation there.
Not to mention the weird stuff happening on the second half of the chart, with Aluminum, as a base metal (and therefore pulling) getting an Allomantic stealing attribute. Grah.