I often find myself switching between tabs in the Content Pane. I go from List by Selectability, to List by Snapping layers, back to List by Order (Visibility).
It would be so very helpful if there was an ability to "pop-out" those Content Lists into separate panes so we don't have to constantly switch back-and-forth between Content List tabs.
The interface would be something like this:

Once it's open, you could have them side-by-side. This would allow for an interface with less clicking when you need to adjust various settings for layers.

--OPTIONAL IDEA--
Instead of pop-outs, keep the single pane but move Selectability, Editability, Snapability from tabs to 3 separate check boxes next to the layer names. Below sketches out the idea with the check boxes to the right of the layer names, but they could be off to the left, as well, with perhaps a "eye" icon above Visibility.
