The hotbar at the bottom of the screen is incredibly useful, but I always need to swap stuff in and out of it based on my project. I wish we had more hotbars that we could toggle between automatically by using modifier keys like Ctrl, Alt or Shift.
So, for instance, I could press 1, and then build whatever I have in shortcut 1. But then I could press Ctrl 1, and build something different.
Alternatively, simply give us a keybinding to swap between a series of different hotbars