Though not necessarily part of the mock-ups, but as part of the layer docker redesign it would be great to consider double clicking to access layer styles. Or to access properties for file layers, fill layers and filter layers.
In the same way, double clicking the opacity slider (and sliders in general) to use type-input would also be nice QOL improvements. I’m so used to double clicking as opposed to right clicking, I doubt I’m the only one who learnt that habit.