Shape layers could really use some love. I propose that the same way we add selectors and properties to Text Layer animations, should be used for Shape Layer Repeaters.
Draw a square, repeat it 10 times, now add a range selector with position and scale. think of the cool mograph type effects you could create with that system, The best part, is that Shape Layers and Text Animators are practically cousins, so I don't think it would be to hard to implement.
Bonus would be to also have the same path options that Text layers have as well, imagined if you could repeat along a path!!!!! so many possibilities.
Also wiggly and expression selectors would open up so many new doors.
Visual:
https://i.imgur.com/wEQELHo.jpg