Pre-Level "Setup"?

Hey, love the game, but I had a thought.

What if, instead of needing to manually pause at the start of a level to place your initial units, you have a “setup period” wherein you can place your units, but also recall them at no loss, so you can get it just how you want it to start with and don’t have to start your whole initial setup over if you misclick or something.

It should go without saying that spawn points should be visible during setup, but I just said it anyway. Ah well.