When Double Clicking on Mask/Shape layers in the toolbar, hold a modifier key to constrain to a 1:1 ratio
When double-clicking on a rectangle or oval Path Creator icon in the toolbar, it creates a centered shape to fit the bounds of the composition. I would love the ability to hold a modifier key to create a 1x1 shape that fits the bounds, i.e. a centered square or circle. There's almost no easy way to do this otherwise.
This shipped recently, please download the latest build and enjoy!